child psychological disorder

My 11 yr old boy is very isolated, has no friends, if he does it is short lived and it is only because he calls to play - they never call back. He is not very nice (not a bully but very critical of others) he plays sports but and gets along but no one ever invites him to play after the sports. He has a vast imagination and plays by himself all the time (throwing a ball, shooting a hockey puck, used to play with action figures by him self) He is average in telligence with no academic issues

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