Hi fortune, welcome to the forums!
what you're feeling is what many of us, including me felt when we first quit. we felt lonely and confused. As you said since gaming was our social circle, when we quit we don't know where to go. I'd say if you want to become more social, i'd try to label out what your goals are and find activities that go hand in hand with that. for example if you wanted to become more active you could try hiking, running, or canoeing. i think that common interests are much better on the social side than just looking for a particular person to talk to. another good place to start though is going out and just small talking with someone like "hello! what's your name? what do you like to do?" although that second option might be a bit out of your comfort zone for right now. i hope this helps. i wish you luck on your journey
best
jason