I don't know who I am

I (22M) don't really understand who I am. I started uni recently and it's been really busy. I probably only have ~2 - 3 real hours of free time everyday. I squander most of those hours on the internet.

I have very few interests, some of them I do occasionally (like once or twice a week), some I have given up on since uni started. I don't watch any TV shows, barely watch any movies, don't play video games, don't listen to much music, don't have many close friends.

I started going out for walks, twice a week just an hour walking around (without using my phone) to try and "spend time with myself". But I still feel I have no idea who I am. And whoever I am, I'm deeply uncomfortable with.

I appear unavailable to others, because I tend to keep to myself and I don't want them to see that I have no personality. Chatting becomes difficult because I have nothing interesting to contribute. This makes it hard to make and keep friends.

Yet I don't want to "fake" a personality by doing things just for the sake of being more interesting. I want to really dig deep and understand myself, love and unconditionally accept who I am and work on my flaws, but I don't really know where to start.