To be at peace with myself means to accept myself the way I am; to reduce the split that is created by the image of what I would like to be and who I really am; to be patient with myself, especially in regard to what conflicts with my idealized self.
Peace of mind has nothing to do with the external world; it has only to do with our connection with God. Love really is the answer. We're here only to teach love. When we're doing that, our souls are singing and dancing. When we remind ourselves that we are spiritual beings, that life and love are the flame eternal, that's when our soul is nourished.