So many takes and advices that could be taken on this topic, I'll keep my $0.02 short: Get a pet.

Perhaps this can also save you a little bit on psychotherapist costs: Learn to like yourself, and your own company.

Humans are social animals though, but don't try to be social for the sake of it, do things you like that involve people, and be nice to them. OTOH, I've met a couple of Uber drivers that are in it just for the social interaction of it (like retirees mostly). Others here will probably have better tips on this topic though, hope that helps.