I did my masters thesis on adolescent loneliness and extracurricular activities.... Found that kids who were less lonely were the ones that "hung out" with friends... Did social activities... Actually participating in formal activities didn't help.... I suspect it would be the same with adults... You actually have to interact with people. I think it's harder to do that in the modern world as we are so much more isolated from our community than the past (when I say community, I mean people we care about, rather than physical location).

I guess that means we have to be in contact with friends and family more. Actually reach out and connect.