I think a lot of us come across as aloof to others. I was once called "Isolative" in the hospital because I was staying mostly to myself. I don't make friends easily, and the world was too confusing to me just then. So I mostly just wrote a story I was working on. It really peeved me that they just labeled me, instead of asking why I wasn't out and about. Plus my turd of a pdoc wouldn't give me sleeping pill, so I was up all night, every night, for almost the whole admission. (he gave me ONE night's worth, the whole three weeks.) Sleep deprivation doesn't tend to make you social, you know?
It sounds as tho this lack of friends is a commonality among us. I'm betting that it runs true for most MI, and not just us BPers.