I feel your pain. I also found socialising at university difficult because I did not enjoy small talks and outdoorsy activities, which prevented me from having course-mates to call friends. But I have come to terms with the fact that I enjoy deeper conversations and relationships over superficial ones, and I read books to preoccupy myself.
In your case, however, I would suggest actively reaching out to any of your course-mates via email or in person, even if it’s one person who you find interesting, and try to develop a relationship with them through hobbies, conversations, tackling assessments together etc. overtime, he/she will probably appreciate your company and introduce you to their network of friends and acquaintances.
If you cannot actively do this, I suggest you look for school activities that will force you to expose yourself to other students, like a course rep position, or social activities. Maybe with this, you’ll attract potential friends.
Or, just go my way, pursue hobbies that’ll preoccupy your mind and this forces you to derive vitality from within, not without!
I hope this helps!