I have a son like that --- but he's perfectly happy --- he's never called up a friend, none call him, he's never brought home a friend, he's perfectly happy to go to school but he's asocial --- happy in his own world, taking broken radios apart, playing with anything electronic, growing plants. He doesn't care what the crowd is doing, he seems to prefer animals --- horses, dogs, etc to human companions. Even the teachers don't think he's got a problem even though he has no friends because he seems quite happy, suffers from no peer pressure. He doesn't get picked on either --- I think if anything the others really he really doesn't care enough about their opinion and if anything he's well-liked at school.