This sounds more like you not really being aware of your qualities, and/or you looking at females who would not be a match for you (meaning neither of you would be satisfied if you tried). While there do exist qualities which make people truely unattractive (disorders such as uncontrolled rage for example), you don't say that.
It's true that mating choice in humans is foremost the female's choice, yet you might be surprised by what they see as qualities to appreciate. If you are an introvert, despair not, because 30-ish percent of all people could be classified as such, and that specifically could be seen as an appreciable quality by a woman who also sees herself as such ...

You are only invisible if you literally hide away. -- You do not give us much information as to why you think this way, or about your cultural background. You might be truely physically impaired or clinically depressive, or part of a culture where men and women are mostly kept separated, and that would actually make it more difficult but not impossible at all to find a match. Not having such information, i will refrain myself from just telling you to "go out of your hole more, man" and such. --

May we perhaps get a hint at your age? Because answers could get more helpful if we knew. (Don't ever think you are too old)

Yet, in whatever way you are set up, think of it like this: there are likely, literally, millions of people in your area and half of them are women, and a good percentage of those are in your age range (the older you get the wider this range gets). You can be certain that there is a sizeable number of women who have the same kind of thoghts and feelings as you do right now, and perhaps more important even, Your emotional and mental state can and will change.
In other words, you are certainly not unworthy in the eyes of the one you would not have expected to find you attractive. Of course, you need to actually show up in places where you likely meet people who share your interests (iow. "find you attractive") ...

My own experience: considered myself an "introvert" (until more recently i learned it's likely "more than just that"). Had great difficulties finding the right approach toward women in general, until i was 25 ... when it happened for the first time that a woman approached me, in a very assuring way (like, "want to come home with me, we make food and then I'd like to show you around my bedroom"). I took the chance and although i was "easy prey" for her it was the right thing to do because she was treating my inexperience in a sensitive way. Nevertheless, she was not a good match interest-wise, so that lasted only a couple of monts (and broke in anger).
A year later, a similar thing happened again ... at a seminar after-party, a student colleague who i wouldn't have thought of just so asked if she could stay the night with me. She didn't appear the most attractive to me but neither did i seem to be particularly attractive to others. Somehow i was wrong. That time it turned out quickly that it was me who was the more experienced one. ... And that woman was an "introvert" match (whom i now think of as being "more than just introvert", too) -- we've been a couple for seven years. ...
After that, both our paths in life changed considerably so we broke up in mutual agreement that we both needed to experience new things in life (i found a more spiritual-leaning path and learned what "love" is really about; she went with another man and discovered that she wanted to have children after all). ...

The relevant part here is that despite me thinking of myself not being particularly attractive, it kept happening that women just approached me, asking quite explicitly. -- And it almost always happened when i had gone into the company of like-minded people, but without the specific intent to seek out a woman. I can only remember one time when i did make an explicit move myself (even at that occasion i knew that i wouldn't get turned down because of the way she went all so lovely excited both times we had met before).
All in all, i wasn't together with very many and now that i'm older i still miss finding my true partner, but i can say that any of the experiences i got the chance to have, had its distinct flavour of enjoyability (well, perhaps minus the one time she later admitted she had abused me). Many of the women i love, i did never even get close to. A couple of times it was me who had to leave them behind because our paths just couldn't go together. A number of times it was sexual enjoyment for a number of days.

If you are asking, how does it feel ... well that's asking for poetry. Every experience is different though, and so will be yours (yes i say it will). It can be very satisfying, very lacking, questionable, exciting, soothing, mind-melting, enchanting, hurting, teaching. Pick yours. :-)

You are damn right when you are frustrated, and you are damn right in expressing that.

I am sad and embarassed (right word?) about all the unempathic comments you are being met with.(*) I'd say ignore them if you can -- literally put them on your ignore list if you wish, and take them perhaps as your involuntary helpers who demonstrate what you are usually met with (if this is the case). So that this has a purpose and doesn't hurt you ...

Like someone else commented, you probably do not want such people to be your "friends" -- they would only be friends with that mask you present to them in order to appease. Your frustrated/lonely expression is a mask, too. But that one they don't like and why you wear it doesn't interest them.

Kick that idea that you are disabled (i know, i know, but try to push it away) and it will help you to relax (that's important). The more we train a specific thought pattern, the more that will become our only reality.

Being on your own, or being in the position of the quiet observer for the time being could actually be a good thing to have, as it will give you inner and outer room to move (away from the rigid/unrelaxed idea which makes it seem a burden). Look for such people whose presence you would enjoy. That is, such people whith whom you would resonate, naturally. Those might be the ones who are able to observe beyond the mask and those who play alone. They might not be the most relaxed ones, initially.

The good fruit are rare and you are young. I hope this resonates or is at least a lottle comforting. From someone who had many developments happen ten years late.
[leaving that typo as-is because i like that word ... a lottle]

(*) I just held myself back from answering each of those comments with "this hurts" ... but it would have me spam the comment tree. Leaving it up to you.

The whole of paleontology/paleo-anthropology has this problem because for remains of organisms to be preserved certain conditions must be met, which is not the case everywhere at any time.

Privacy means that you can talk/act safely in your own closed-off space while no-one knows what you do. The opposite of private is public.
Anonymity means that you can safely talk/act in public space while no-one knows who does it. The opposite of anonymous is ... identified.

If you want your talk be private while doing it in public or via an untrusted service, you can use obfuscation/encryption of the content/payload data of your talk (still anyone could receive it and know it's from you and if they have the key they can decipher it).

If you want to be anonymous in public space, you have to obfuscate the metadata of your talk (so that no-one knows who said it but anyone can still receive it).

*And here is a bit of an overlap depending on where we want to draw the boundary of our privacy realm. In some cases, the knowledge about metadata like location and time of a message can be breach privacy while in other cases this is irrelevant.

You could also do both, meaning you'd have an anonymous appearance in a public/untrusted space, having a conversation with only those people who have the key to your messages. That's a stunt which is not easily accomplished, as obviously you'll need a way to let others know how to reach you, and exchange keys (in other words, you'll have to first make an appointment in private and in a trusted space).

[wanted to write two sentences, no so much text :-D]

Relevant link: https://interpeer.io/blog/2023/07/google-vs-the-open-web/
Bottom line: Google want to introduce a live certification process for web clients so that webservers can potentially discriminate against specific configurations.

@Shaul@lemmy.ca

https://en.wikipedia.org/wiki/Constan%C8%9Ba_Casino

Besides all the very interesting comments and links here about the violent history of the area, here's an answer from one Israeli guy I once asked a similar question. His take was that it is basically a mafiose environment now ... "both sides are corrupt to their core" -- the religiosity of the people would be abused by profiteers.

Oh man the various English' pronunciashuns ...
https://m.youtube.com/watch?v=SfhKldRKmo8

Being annoyed is only one of the reasons for shying away flies but most times it would be waste of energy and attention.

Obviously, never enter your real number in a web form unless the service depends on you getting called back ... in which case you likely would have called the company by phone anyway.

No water allowed that essentially excludes all beverage. If i could have anything else, i'd go with at least two kilos of fruit and berries per day, preferably melon, cucumber, oranges, cherries, raspberry (any berry actually...), plume, pear, apricot. And the occasional fish.

There may be several answers to this. This is my somewhat simplified take.

One is, it's a (series of) physical action (heating, gasification, pyrolysis -- break-up of molecules of the fuel) and chemical reactions (oxidation). Oxidation means in general (in a commonly accepted model) that an atom shares away its outer electrons, which makes it acquire a lower energetic state. Oxygen is one element that is eager to attract such electrons for the same reason.
Whenever such a reaction happens, the superflous energy is released as a quant of electromagnetic radiation (a wave/particle) which we call a photon (it's therefore called an exothermic reaction). Photons can appear to us as visible light (that is wavelenghts in the visible spectrum). The wavelength of a photon inverse-correlates with the energy of the photon (blue > red).

Getting the reaction going however, requires the molecules of the fuel to get excited with energy in the first place, which is the required activation energy. This can be done by heating the atoms of the fuel. And as the oxidation also emits heat energy (far infrared), and in fact more than what is required for the whole phsyical-chemical process to happen, it can sustain itself (given the right conditions, see the second answer). This self-sustaining gassification, pyrolysis and oxidation we call a flame.

Flame colours are composed of the glow of gases at different temperatures ("red" is colder than "white") and the colour corresponding to the wavelength of the photons emitted in the oxidation reaction (simplified). In a typical candle flame, we see mainly hydrogen burning at the lower end (where the flame is blue but the gas is still reatively cold). Carbon takes a bit more activation energy (burns less easily), so it will start to oxidise farther up the flame where the gas is hotter. Carbon will make an orange flame at these temperatures. Other elements burn in all kinds of colours. A burning copper wire will make a flame glow green. Print colours on paper can contain metals which burn in different colours.

The other answer is how I explain how to make a "smokeless" campfire.
A fire needs three things: fuel (something to burn, wood), oxigen (air), and heat. Smoke is just the gases coming out of the wood condensating because they are either not hot enough for activation of the final combustion, or there is too little air getting into the hot zone of the fuel. Anything that is smoke could be a flame when the smoking part is put into a hotter place. Black smoke usually means that there is too little heat for the carbon to get fully oxidised. Cold fuel and having to evaporate water in the wood generally takes away heat from the flames.

TL;DR: A flame is a self-sustaining combustion process in a mixture of gases that needs to be hot and be steadily fed with fuel and oxygen. The gas is so hot that it glows.