You can start by forgetting what age you are and hang out with the people of the age you feel like hanging out with. Bars are a waste of time, sure -- they're noisy and pretty mindless. But that's not what you really want. There might be younger people you might get on with but literally all you need to do is be the age you are inside, and make those friends. You're at the age when you have figured out what doesn't make you happy, evidently. But then maybe you know what `would` make you happy, if you could attain it, so go after what you want.

Feeling is the Secret (1944) by Neville Goddard https://www.youtube.com/watch?v=ffNWoefuwPM