Sup CassCalvin,
I agree w/ Jete23 in that you need to sit your folks down and have a heart to heart w/ them. I do understand what you said bout why you feel you can't, but I learned from personal experiance that keeping stuff bottled up with only cause you more stress than you already have inside. If you do decide to tell them, start off with telling them to have an open mind on what you are going to tell them, cause you really need their support at this point due to you still being a teenager, which means there is still hope for you to get this under control b4 you start acting on these compultions.
I had a friend little while back when I was a teenager (I'm 25 now) who sometimes did some stupid things to himself, but his folks never knew he was doing this, they seen him as a respectable boy. One day he woke up with the conpulsion that he wanted to go to this store and beat up this old guy who worked there. I don't know what caused him to want to do this, I think it was cause he kicked him out of the store cause the guy @ the store thought he was stealing. He called me up and asked me to come over. When I got there he told me of this idea of doing this, I went back and forth with him to get this idea out of his head. Finally, after a hour or so, he asked me what would I do if I had these urges to do this.......my response was to first off not act on them, cause back then I serious feared the police for some reason, I think it was from the Rodney King thing, anyways back on the subject at hand, I told him to talk to his parents on this idea, he did that night after I left. The next day I called his place, he said he was glad that I convinced him not to do it, and instead talk to his folks about it, cause he found out that his parents heard our (his and mine) lil dispute, and were worried that he was going to become a juvenile dilinquent (how ever it's spelled) and were suggesting military school if he did go thru w/ this.
My moral to this is this, you have problems going on inside of you, why not confide in someone TRUST, your parents. I feel that if I didn't let my folks in on some of the stuff I've done in life, I would have done some very dumb things in my life. They understood my thoughts, and convade me to see things from all sides before attempting my actions, and since that day I've helped prevent some friends from doing very stupid stuff, even some from killing themselves.
I feel thru time you will find the conclusion you seek on what to do for your situation. Sorry for the long typing, sometimes I type like I talk.
I will say a prayer for you tonight for a wise decision on what to do. God Bless