1. School workloads were demanding
2. I'd prefer living alone, provided that I have people to spend time with when I feel like. Also, I was new to the area, so I did not want to have a roommate until I find a good one.
Look for good roommates. The more social the better. I also was similarly uncomfortable with roommates, commuted to college, lived alone, and one day in my early 20's I made a choice to deliberately do things that make me uncomfortable and it changed my life forever.
Step out of your comfort zone. Its the only thing that will change your situation.