Hey hun!
I'm starting uni in September myself and worry about the same things- even though I went to a different one last year! The best thing you can do is put yourself out there, especially during freshers. Everyone is in the same boat and everyone feels lonely and scared at times during university. But believe me the more you get yourself involved the easier it'll be. Join things like societies that you wouldn't think you'd like, even if you don't enjoy it you can make friends along the way- or you'll discover a new passion!
If you dont mind me asking, what uni are you going to? I'm starting huddersfield in September