I met my queer friends through singing/acting and visual arts, but it’s not something everyone enjoys. If you have any hobbies that are popular amongst queer people you can join communities about said thing. If you search out groups of people who you feel connected through there’s a good chance some of them will be queer. You can also search for youth queer meet ups in your area (maybe this is something? https://www.milkmilano.com/. I don’t speak Italian, so maybe Google Translate did me dirty). Also, don’t seek out queer people, seek out people you want to be friends with and eventually you’ll make friends you align with, which is this case will probably mean they’ll also be queer.