Personally, I want a single mainly for anxiety related issues, but that’s just me.
I asked my Choate host about this (whether I should request a double or single) and they said a single wouldn’t be all that much worse for your social life—dorms are generally tightknit so you’ll have a good group of comrades no matter what. However, having a roommate is guaranteed social interaction, so if you are worried about that I’d say get a double.