Advice for Making Friends as a 22 yr old?

My whole I’ve never been good at making friends. I mean I can interact with people fun but when it actually comes to forming solid friendships I just seem to be missing something. I have my sister and then my best friend (who for all intents and purposes is my boyfriend) and though I love them both I don’t want to suffocate them. I really need to branch out and get a life but I don’t even know where to start. Like how does a normal 22 yr old meet people and make friends?