I think its easy to walk into lectures and not know anyone, even after your first year, but its up to you to make friends in Lectures and Tutes. Tutes more so, if you dont get into classes with your friends and choose units as fkn a collective social group, you'll find you dont know many people and you'll have to SOCIALISE. I know sometimes you just dont want to interact with humanity, but if you want friends its what you got to do

Ceebs, I know.
Also, I think uni has more of an emphasis on independence. Dont get me wrong, I'm not telling you that you dont need friends and that you shouldnt make friends, but Uni is a place where you have to do your work on your own, where its your responsibility to go consult with tutors and stuff, so dont expect to make friendship groups that you go to classes and stuff with, because your mates will chose different units and have different timetables as you, and no one will be spoon feeding you stuff. I have friends that do my course, but I hardly ever see them.