I met my husband when I was 34, I think. But I had been single and ecstatically happy about it for a year beforehand. You have to be I think. If you aren't happy being single, I think it's much harder to find a suitable partner because you end up dating any old trash just to avoid being alone.
I had mh problems all through my 20s so I didn't even have the job/friends/home etc. And I wasted a lot of time thinking that everyone else had it all figured out except me.
Your life is now OP. It doesn't start when you meet someone. Every day is the day when you can decide to change things. If you're not happy with how things are, what can you do differently? Because Mr Right doesn't just fall from the sky or turn up while you hang around waiting for him. So you have to make it so you're happy/satisfied being single. If he turns up - great. If he doesn't - that should also be great.
Yes, nature is cruel in that we have a limited window to have a baby. But there's adoption, there's fostering, there's IVF etc etc. There are a million options for people these days. And you don't HAVE to have a baby. If that's what you want, figure out how it's possible to do it alone.
The ones who got married in their 20s may be happy, may not be. We don't know what's going on in other people's lives. By the time you get to 40, you start seeing all the divorces, cheating, 'love you but not in love with you' scripts play out over and over. Not everyone. But enough to know that the 'fairytale ending' is not a thing.
I did a lot of meditation, mindfulness and radical acceptance therapy. I wouldn't say I'm not the happiest person in the world, but the happiest version of me. I feel at peace with whatever happens. I love my husband and he's amazing, but if I didn't have him, I'd be happy too.
He's not the person I need - I'M the person I need. Get to that point and man/no man, you'll be fine.