Just Want To Know Why I Usually Use People To

Just want to know why I usually use people to get what I want, when I want and seem to have fun seeing pictures of them inside my head that I am hurting them. I usually do things that I don't want to do as if my body acts on its own. I am kind of aware but not totally aware because some words just comes out of my mouth and I do things that I don't want to do. I usually wake up being startled as if my body just moved on its own. It have been experiencing this for 6 years already. I thought it was normal but someone in the back of my head told me that something was wrong. I recently had an argue with my aunt. I began to get so angry I hurt myself and can't hear things clearly and said things as if it was too easy to say things that are not nice.