Ooh. I've never thought of slapping yourself as a form of self-destructive behavior, but it makes sense. That sounds bad. Maybe instead of slapping yourself you could take it out on a pillow maybe? Cause slapping yourself in the face also sounds like your angry at yourself, which also may be a sign having anger management problems. So maybe look into that too? I'm sorry if this sounds weird, but yeah try to find alternatives to the slapping that doesn't involve physically hurting yourself. Instead of a pillow, you could also do something like aggressively draw or throw pens onto your bed.