I guess i could be classified as a secret schizoid: i can actually show good social skills and can manage social activities, but i keep it at a minimum: i just talk and do the strict necessary in order to appear somehow "normal" and not get bothered. It doesn't take much effort and i can still be alone most of the time.
Also, if people ask me "Why are you always busy?", i just tell them that i have to study/work, even tho i'm very fast at those activities and end them very quickly. Considering my outstanding results, there are even people who think i study the whole day, when 80% of the day i just ###$ around (20% comprehends sleeping and eating/shitting) and just study 5 days before the exam.
The problem is that people:
1) Do not understand the concept of different
2) Can't mind their business and behave themselves
3) Do not understand that they are annoying, silly, bothersome....
So i just wear a social mask that works quite well. As i stated before, i often studied and analyzed people's reactions, so i kinda know what they want to hear (and so far, i've always been right).