Sometimes when I'm mad, I will hurt myself and not let my mother know about it. What do you think about that?
Why do you keep it from your mother?
I hate how I hurt myself and I keep it a secret from my mother.
If you are causing yourself harm, you should talk to a therapist. It might help to get to the cause of your behavior so you don't have to lie about it your mom.
Nah, I think I'm going to keep it to myself and keep it a secret.
If you keep it a secret then it is going to get worse and worse until you cannot control it. You should tell someone, if not your mother, then a professional. Help is very important to keep this from getting out of hand, trust me.