How do I find Peace?

I'm in a battle. The enemy is as close as a person can get to me...for it is myself.  See I can be very mean and vicious to myself.  Why do I treat myself this way?  I would never dream of being this mean an awful to another living soul, but when it comes to me I am relentless in tearing myself down. I have no compassion for  the weaknesses I have. I can beat myself up more than anyone else ever could.  I need to learn compassion for myself and to be patient that I am not perfect. I don't know why I keeping doing this to myself.