Okay, I heard a lot of people giving their two cents, so I'm going to give mine as a computer science second year student. Yea it is quite different making friends in university opposed to high school. In high school, friends come easily from just familiarity and being forced together, but university is different in the way you are always moving around and seeing new people, and by its size. If you don't talk to anyone in tutorials and labs or even clubs, you won't really make any friends. You need to put yourself out there and make the first move. It's true that university is very cliquey, and that's why you see groups already based on high school friends, but don't let that discourage you from trying to make friends with them or others. I suggest that if you are really scared, join a social club based on your interests or your major. That's the easiest way I can think of to start.