Assuming you actually try, it's extremely easy to make friends at university, I really wouldn't worry about it, I was damned shy too before I went, but I still made friends nice and quick.
And when I say try, I don't mean you have to go overboard trying to make friends, you just have to avoid being one of the people we inadvertedly see every year on TSR saying "I've spent the whole first term in my room refusing to talk to anybody and I haven't made any friends, I don't understand why"