Some people try to hide their
inner nerd behind a streetwise or athletic facade, or some other facade they think will get people to hand over a key to
something. They try to out disarm anybody that might try to disarm them,
to the point that it's kind of silly.
He/she had learned to keep his/her
extrovert facade most, if not all of his/her life so that
most people that had met him/her and didn't know him/her well would believe in it, though it had always been
transparent to one or two that knew him/her well.