> I tried to meet new people at hobbies and dance lessons, but guess what - they're all full of lonely developers and other socially awkward people - short guys looking for girlfriends, unattractive/aging women looking for husbands, etc.

So what? Lonely developers can't be good friends? Short guys looking for girlfriends can't be good friends?

Sounds like they would solve your loneliness problem but you are too judgemental to accept them