Sharing a room can actually be a lot of fun, and useful, especially in the first term as it means you do meet people. Your college should try hard to match you up with someone who you will get on with. When I filled in my application forms I didn't want to share a room, but have ended up in a shared room and I love it. It's huge, my room mate is fantastic and we get on really well, and will still be living together next year. If sharing a room really doesn't work for you then you can always ask to be moved to a single room and colleges will try to sort this out.