Think about what you are doing. What is making you do this? Is it worth harming yourself? I know that the issues you are facing are not worth harming yourself and you can stay strong. You need to ask yourself questions on why you are doing this and realize it is not worth hurting yourself. Hurting yourself does not change the situation.
Talk to someone. A stranger if that will make you more comfortable. Everyone wants to help you. Remeber that. My son was there. He finally got help from friends who'd been there. School counselers. Church. Look in the front of the phone book for listings of places to help. Call the local Crisis Hotline, please. Wishing you the best. Hang in there.