I have an uncontrollable urge to slap myself silly
Can you tell me why you feel the need to slap yourself?
It bothers me to talk about it, but I feel half crazy sometimes.
It's possible you're self-harming yourself because of something emotional that you're trying to deal with. You should speak to someone ahout this and see if you can figure out what causes you to hurt yourself.
Why would I bother to find out the cause? I'm used to it at this point.
Wanting to hurt yourself has deeper causal relationships that need to be explored. A counselor could help you unravel these mysteries if you would give them the chance to support you through this process.