I can't speak to the room sharing concern, as I have a single. Many colleges offer *some* singles to freshman, so if you are interested in such an option, look into it sooner rather than later. If not, remember that a successful cohabitation arrangement relies upon following an agreed upon set of rules, being flexible, and trying to work through problems maturely. In cases where a truly significant issue arises, talk to the RA. If it still cannot be fixed, remember that you can usually get your room moved.
A LOT.