I don't really know who I am and it's starting to freak me out

I feel like everyone around me knows exactly who they are and what they're into. And I'm just kind of going along with everything without really knowing what I actually want or think. I like my friends but I don't always feel like I fit in with them. I just haven't said anything because I don't even know how to explain it. I started thinking about how I actually feel after hanging out with my friends versus how I think I'm supposed to feel. Like I'd been going to parties and stuff and just feeling kind of empty afterward and never really questioning why. I also started paying attention to the small things that feel right versus the things I'm only doing to keep up. I realized that the whole "why am I even doing this" feeling I keep getting is actually telling me something. It's not just me being weird. It means I've been doing things for the wrong reasons, to fit in, to keep up, not because I actually want to. I decided to start being more honest with myself about what I actually enjoy instead of just going along with whatever my friends are doing. I also realized it's okay if I start growing in a different direction than them. Finding people through things I'm genuinely into feels more like me than forcing it with the group I have now.