join clubs, go to events on campus, sit next to people in class/talk to them and get their info! the last one can especially help with getting to know people in your major if you have one, which can be really useful down the line. i also made my closest friends freshman year just hanging out in the common areas in our dorm space, as long as you’re not hiding in your room all day you’ll meet people! :)
I was the same way, and clubs/organizations helped me so much!!! I also leaned a lot on my friends and family from home, and it helped to know that I had a support system already. Having a secure base made me feel safer reaching out to other people at college without it feeling like a risk.