Ugh, that must be frustrating! I know all too well what that feels like...I can only handle being with a roommate if I have my own room and dequate time for myself.
Since you're sharing a room, maybe you could put on some headphones while he's around, and make a point to go outside for a walk whenever possible. Also, hit up the library, especially if it's a huge one.
Best of luck!
_________________
Given a “tentative” diagnosis as a child as I needed services at school for what was later correctly discovered to be a major anxiety disorder.
This misdiagnosis caused me significant stress, which lessened upon finding out the truth about myself from my current and past long-term therapists - that I am an anxious and highly sensitive person but do not have an autism spectrum disorder.
My diagnoses - social anxiety disorder and obsessive-compulsive disorder.
I’m no longer involved with the ASD world.