The important indicator imo isn't dysphoria per se, but euphoria. If you for example were to feel fine either way but feel happier being a guy, then that's a good one.

The way I came out was basically figure out how certain I was of it, then tell to my most trusted people, then spread outward.

Yeah it would have been easy for my parents to think it came on suddenly, hell I had a beard when I came out. I was also heavily involved in trans forums to the point my username was well known to the people there every day, I had been out to my friends for nearly a year, I'd known I wasn't cis for over two years, and I'd been struggling with dysphoria and the desire to be a girl/woman my entire life. It's just that I'd tried to go all in on masculinity in the hopes it would help and it didn't

That is dysphoria. You don’t need to physically hate the body your in, just want to be in a different one.

And likewise your reasons for not wanting to transition aren’t based on not being trans but on social stigma and having to deal with it.

Best way I heard it is that no cis person is out there giving the time of thought to this subject.

Luckily if you’re going FTM there’s less issue with age, as you can develop a masculine presentation later in life via HRT. Take the time you need to find yourself.