Relapse #2 : Isn't physical pain better than emotional pain?

I don't understand why some people say you shouldn't hurt yourself.
I mean, people hurt each other all the time, so why can't I hurt myself once in a while.. ?
I own me.. Its my hand.. Ill do whatever i want with it..
I will feel my own pain and look at my own scars.
So, don't tell me not to hurt myself.
People hurt each other all the time, so why can't I hurt myself once in a while.. ?