The don't have to be withdrawn. that is their (our) natural state of predisposition. I used to be very withdrawn but through the events of high school I became convinced that the social aspects of life wasnt something that would come naturally so I put fourth effort. I really truly am a INFJ but the social things i do can appear at a distance as extroverted. this brings me to my point, I believe that these profiles are an amazing way to describe people but they do not define them. But this is an older thread and im probably kicking a dead horse. But I wouldn't be surprised if many are miss classified.