For many, many years I did not actually care very much about maintaining an active social life. Then my head-doctor started me on a new drug and I found myself feeling strange, uncomfortable things. For example, I desired to know more about my classmates. When I was alone, I noticed the absence of other humans. I would see people standing in groups, and wish I were included in the conversation.
It was bewildering and unsettling.
I have since started seeing a different head-doctor who is supposed to be helping me learn what normal social interaction is like. (The VA in Boston is a godsend.) I say "supposed to" because he has so far refused and I am going to be requesting a new person to work with.