I’m having a ridiculously hard time making friends in university

I go to a commuter school but live 2 minutes from campus, my school (SJSU) sort of has a reputation for being socially dead, but I know for a fact that lots of people have very active social lives on campus. I have a roommate who is now my friend and he is incredibly social, so because of him I get to meet his friends and they’ve always been really good people.

But outside of my roommate, it feels almost impossible to make friends in class. The only class I’ve managed to make friends in is my swimming class and even in that class none of the people that I talk to I hang out with outside of class. It’s like they have a friend group already and don’t really need or want to hang out with me outside of class.

I’ve been working out for 2 years and have been developing my social skills for around the same time so I don’t believe it’s my external appearance or seeming weird/awkward that is the reason. The most common advice I’ve heard is to join clubs and organizations on campus but none of them really appeal to me and I’m not really a frat kind of guy. Does anyone have any advice at all that could help? I would really appreciate it, thank you for reading.