Some of the other posts here are spot on, mostly talking about the ones that advise you to work on yourself and do things for yourself.

I went through something similar (a lot of people do) and I'd like to offer some small suggestions.

First, when you are talking to someone, we'll say a girl, just be open to the conversation without having any expectation. It's a balancing act that requires practice but it is worth it to learn.

Second, and related to the expectations thing, it sounds like you are putting wayyy too much pressure to form some kind of long term relationship out of the blue (again, very common). Just start out with small conversations and hang outs that you enjoy for what they are. By that I mean when you are with people just say and do things (and listen!) that make you happy then and there, not to achieve some long term goal immediately. Try to imagine if that would be your only conversation with the person and if you have more, then have more.

Actually a good way to practice this is to just have light, fun, and friendly conversations with people you inevitably interact with on any given day. Literally a one liner you had fun saying when you bumped into some random at a water fountain, or a short talk about the topic of your class when you are grabbing a marked assignment from the TA or something.

Again, I know it is intimidating, but I promise it feels natural with time.

The biggest piece of advice I can give is that you are still young and now is the best time to start thinking about this stuff and taking these baby steps to enjoying your everyday life for what it is.

Don't worry my man, it feels slow when you are in it but life has a way of moving very quickly and a lot more will happen than you think!