My friends think that I'm developing a personality disorder (Narcissistic Personality Disorder) or a superiority complex, I don't know what to do about it or what to do with myself. Ever since I entered my teen years I became a different person, which would be okay and normal, if it wasn't for the fact that I'm coming out to be a bad person. I never tell people, but the truth is that I'm insecure and have a very frail ego, and when I do poorly on tests or assignments, I feel worthless and useless. So i either work myself down to the bone, and when that doesn't work and I wantto try to make myself feel like I'm worth something, I hurt others and bring them down, I hurt them, mock their insecurities, Insult them, I start arguments out of nowhere and try to win every time, sometimes I even hit other people to make myself feel like I'm better than them, to have control over them, make them feel small. And I hate my own behaviour, because I know that it's wrong, but I don't know what to do