Why am i so paranoid?

i think there maybe something wrong with me, ive been abused as a child and teenager, it all stopped last year, ive taken cannabis, hash, pot, inhaled nail varnish remover and deodorant and i now get very paranoid at night i wont go certain places because i always fear somone is following me, i get very irritable and angry for no reason, i have random outbursts where ill smash something up then laugh by myself, i dont feel any remorse or guilt for some reason, it just feels like a part of me is missing, i dont have any friends and i dont really want any if i did it would only be for a benefit of mine, im always in need of money, im lost without it, people say im selfish and i always look evil. is there something wrong with me? and whats wrong with me? serious answers please