What is wrong with my head?

I dont know, but I'm pretty sure somethings lose up there. Okay for example, i feel like 95% contempt for everything, i never feel empathy for others, i even tend to laugh at things like people falling down stairs. I love horror movies, and feel no fear after they're over, but my friends are like about to piss themselves. It seems weird but i tend to not think about anything... but then full on detailed situations just flash through my head, sometimes tending to be violent, like pushing someone downstairs or stabbing someone, or setting their friggin hair on fire. This doesn't scare me, but more makes me want to know what the hell is wrong with me. I'm not scared to be honest, but I can manipulate people, and used to take pride in it, i don't know what to do, and i don't want a response like "you need to see a therapist" they don't help either, them trying to understand me by putting words in my mouth makes me angry.