My son did not play with his classmates at that age either as they shared zero interests. He did have friends that I found for him outside of school who shared his interests. He is now 2 years grade skipped (age 10 in 7th) and fine socially -- the kind of kid who has a couple of good friends, but no interest in the big social groups. Kids with high IQs can be misunderstood in so many ways.... I second the idea that whatever you do, don't use your school psych to investigate this issue.