Very Violent Imagination?

this is probably because you watch to many action or horror films! you need to watch some comedy, try thinking about something nice like eating an ice cream or what you might buy someone for christmas! don't think abut all the negative things think about the positive things! And also this is in you head, it's not happening in real life. So it's just your head wanting to watch something gruesome! Anyways try to think about other things.