Interesting quandry. I agree with Ruby that you should wait until the appropriate time.
I have an idea that I hope might help. (I am starting college this year too, by the way, and have pondered this as well.) Even though it didn't occur to me until fairly recently that I have some kind of Asperger's, I was always aware that I was quite different from others - the reasons don't really apply here - and I always felt like others picked up on this rather quickly. My friends, I know, have been aware of this forever and, obviously, don't care. Maybe this is what you should try and do with your roommate. Now, I'm not saying to hint or change your behaviour, but just see if they can pick up on it without you two even needing to talk. But, as is the case so much, just see how things go/how your roommate is.
I hope this helps!