As far as I'm aware, they try to put returning students together where possible and freshers all together as much as possible too, largely as they will all be in the same boat/phase of their university journey! I know a lot of people who have gone back into halls for 2nd/3rd/ even 4th years, and they have all been with returning students as far as I know. You definitely won't be the only one, so don't worry!
Hope this helps. Good luck for your 2nd year!
3rd Year Speech and Language Therapy Student