It's not you or people judging you based on your age when it comes to why people aren't clicking on your interest checks and showing interest. It's just a thing that happens to everyone, like it's hard enough for some of the regulars to get fresh interest in their things. Most people I know generally shift from RP to RP in their own group, picking up a few, dropping a few along the way. This is just how it works.

I would seriously suggest listening to some of the prior advice though, especially in dialing back and trying to just integrate into the community first. Join up with a few RPs that look interesting. Make connections with people and get to know them. After a while you'll have some people that you could just say "Hey, I got this idea." and there's a few guaranteed players. This stuff takes time.