I fully get your concern, but this is the one time in your life where everyone at university will not know a soul, you’re all in this together. You all have equal opportunity to get to know each other. Make sure to talk to as many people as you can, attend freshers events and befriend your flat mates as you can all go out together during freshers. Also, make sure to join societies! Everyone will have the same interests as you in these and it’s the perfect chance to befriend people similar to yourself.
I’m going this year after taking a year out, and i’m just as worried as you are. You will make friends though as long ad you don’t hibernate in your room (as my brother likes to say hahah). I have friends who dropped out after a month, they said it’s too hard to make friends yet they are the type of people who never went out of their way to talk to peers, didn’t go and talk to people on their courses, never left their room besides for necessities, this is the worst social mistake you can make.