I know if I had attended grade school, high school or college with someone who became POTUS I would have some recollection of being in a class with him, seeing him on campus or maybe hearing from some other alumnus who did. Yet apparently no one does. Obama's biography is full of holes and clear efforts have been made to suppress his past records. It is at least very strange even if you do not believe in some conspiracy.
There are pictures of him in a yearbook in Hawaii. Several have turned up, one was even sold on Ebay.