I believed something was wrong with me?

just my childhood experiences made me aloof, shy, introvert. i actually believed i had some mentally ill. i did well in school but i had a social phobia. enough for others to ask my relatives whether i was a lil slow. then i joined work, it built my confidence. i became social and friendly. its all a mind game. now i think if by believing i am happy, i will get happy but isn't that just an illusion? how long can i fool myself? isn't positive attitude a false belief? something bad happens but we stay positive. c'mon now, its bad, why make ourselves believe its not that bad.