It seems like every time you get close to people you push them away and retreat (friends from school, first house-mate, now second group of housemates). Commuting from home might be a practical solution cost-wise, but it isn't from a social point of view. You should make the effort, grit your teeth and put yourself back out there, move in with the people who have offered you a place. You've got to try as hard as you can to be social with these people, if you recede into yourself you'll never get out again; University is the best place to open up socially.
The problem isn't that you're short, its that being short/bullied has made you distance yourself from people. Now that you know, make a conscious effort to stop yourself doing it. Go live with your friends and have fun, they obviously don't see you as a short-outcast-guy, so why should you?