As the man said above, summer camps are very unifying places, you can enter friends there. And yet, if you get an interesting job, you can also find friends. Moreover, if you engage in volunteering and help for others, you can also make good friends. The main thing is to do something!
When I was completely lonely, I went to work at a restaurant (although I studied at a university) and met Linsey there. In order to have time to work and study, I turned to
https://au.edubirdie.com/
Now she is my girlfriend and we have been together for 2 years.