Help me! I dont want to go crazy :(?

Ok this may sound wierd but I think I'm addicted to pain its hard to explain what but I like punching walls as I go past them or I would punch a door of a locker at school I like it I like being hurt I get a nervous feeling and it feels good I have a punch bag but that just don't cut it not evan punch with no protection I like cuts and blood I must sound crazy but I don't know if this is comman or not, I also like play fighting with my mates and getting punched it gives me a worn out feeling and just makes me drift and tingly feeling I like headbutting stuff, am I going mad I can't stop hitting things or people just for fun and I can't help but take it to far, I'm always up for a fight I love the pain and I love to inflict pain on others, I'd admit it it makes me look like a prick just give me some advice before I go mad, I work out a lot and I don't get much sleep maybe 5 hours. Thank you real answers please I don't want to live life like this or ill end up with nothing