>>113136043places where you can train are good for socializing nowadays. There might also be p&p RPG rounds that you might enjoy in your city.
To meet new girls, i have found out that a local bank(at least here in germany) is good to find women.
Or go to different stores/bakerys etc. and ask out the girls behind the counters. Just choose stores that you don't normally visit, because you don't want to ruin your favorite store as you can't go in it anymore because of the cringe.
Mind you, i myself don't use any of these methods, because i am way too shy. But i have learned to accept my loneliness. One tip that may help you with that: Try to imagine what it would be like with an actual REAL girlfriend(not a fake waifu). Like, imagine you going "Hey, do you want to see the new sonic movie and laugh about how shit it is?" "Ugh, not really. I would rather go watch teen angst movie #12" do you really want to deal with this shit? Or you try to hold hands with the girl and she goes "I'm not in the mood" everytime.
Believe me, a girlfriend is NOT an automatic "I don't feel lonely anymore"