Why do I feel this way?

I'm 16 and ever since I can remember I've had this urge to gut and skin things. I love it! It makes me feel so good. Sometimes I gut and skin road kill and dead things that happen to lay about the woods. I love to keep all the bones and some of the body parts. I never taxidermy my stuff tho, I just put the skin in a bag in a hot box, it tends to smell during summer but the smell isn't really sickening, I actually enjoy it. I love to kill things when I have the chance, not bugs, but animals mostly, whether it's with a club, a rock, a baseball. I only kill forest animals usually tho, if I were to kill dogs and cats, I would probably get caught, doesn't mean I don't keep'em if they are already dead tho. Sometimes I just have this urge to rip someone's cheeks off their skull with my bare hands. I love handling raw meat. Whenever I have steak, I have it super rare, it tastes the best, but it sickens other people, I love it tho, and it's texture, I love tearing it with my teeth. Sometimes when I'm angry, I wanna tear my own cheeks, but I fear if I did anything, I would be taken away from my parents. I usually bite myself, sometimes I bleed from those bites, but pain isn't anything to me, I love it at times. Sometimes I wanna bite someone's cheek and rip it off with my teeth. Tonight I'm feeling that way, so that's why I wanted to know why I feel this way most of the time.