We occasionally get similar posts here. You might be in a different situation than most of your peers. But certainly not the only one telling this story here on Lemmy. And at 24 you're not even that old compared to other people who are 30 or past that and in a similar situation.

Don't pressure yourself too much. That'd be my advice. Life isn't a competition in who has sex at what age. There is more to it. If you want to focus on career, if if you're too busy or just introverted... That's fine. If you're unhappy and want a partner, go ahead and try to change something about it, go out and socialize, go dating. Just be aware society always tries to pressure us into doing things, like have sex, or a beautiful partner, or buy a big SUV or pickup truck or whatever. The thing is, you're not everyone else but an individual. Go figure what's good for you, and not what everyone else wants you to do. If you let them reduce you to that, that's a sure way to become unhappy.

(Edit: And I can empathize. Any fear of missing out is real. But usually things look more exciting and indispensable than they really are. And you can never change the past. Be a bit careful when growing up not to become some grumpy version of yourself who is just sad about the past and missed opportunities. It's usually more healthy to focus on the opportunities which lie ahead, because these are the ones you can still take.)