Connecting with people over things you have in common/nothing

I started to come out of my avoidant shell and I've found that I don't have much in common with people who are often outside. They know where to go, what to do, whom to hang out with, they make plans to meet up with friends. I don't have experience with any of that.

I go to a gym-class type thing 3 times a week and do yoga twice a week, but I don't really talk to anyone there.

My hobbies before were scolling social media, video games, binge watching series, binge watching YouTube, going for long walks, and maybe reading some philosophy books. That's all I've got and I don't really want to connect with people who've been living in a similar hell; we would just drag eachother down.

Now I'm in this limbo of going out every chance I can (alone at parties, starting conversations with strangers about the first thing I see around me), but not connecting over too much. I could talk to a person about architecture even though I'm not an architect, but I could not discuss about who went where to which concert, restaurant, or what this and that person did.

Plans with a girl I like are not going to plan. She's always busy with something else and never has time to hang out. I don't know if I should just stop texting her and swim in social circles rather than disappointing myself by thinking she is interested in me at all.