I know if I take a step back that I'll be labeled boring
That won't kill you! And if you get good results, the laugh is on those party animal types who've misread you.
It sounds as though you're catastrophising - seeing everything as either lack or white.
So how about dividing up your day - so it's not 24 hours with other people. The trick is to have times when you're quite visible and "fun" and sociable. And then just disappear. You don't have to make a big thing of it. Maybe in your Halls kitchen be around and join in - or even initiate - a shared SUnday lunch, or a bit pot luck dinner party. Something that establishes you as social, but that has a boundary & that you can control a bit.
Settle on a bedtime that gives you enough rest - say 11pm. Be good about just disappearing then - you don't need to make a fuss about it. Get up at a time that gives you some time on your own in the shared kitchen in your halls. So that's 8 to 10 hours for recharging yourself in peace & quiet on your own.
Then do two stints of work - both in the library. do 3 to 4 hours each time, but take a good break in between. Arrange to meet with friends or Halls flatmates.
Do you have a physical activity or sport you like to do? Yoga, running, walking, netball, lacrosse? Do some physical exertion every day. Get out of breath every day. And you can do this in the company of others, so again, you're showing that you're not "boring". But it's on your terms.
Good luck! You really are not alone, as a lot of people have difficulty adjusting to university - particularly to its very different social dynamics. You're a small fish in a big pond, and there's no "safe" haven or parent to watch your bak.
But it's a wonderful time to start to establish an independent identity.