Constantly thinking is like having a constant filter between us and the sunshine of life. We experience life through, in between, and over our thoughts. This shuts out the true light. We miss the direct experience.
I don't know about you, but my GPS system has taken me off-route sometimes to some pretty crazy places. When I go off onto those dark roads that just don't seem quite right, I actually defy my GPS and force it to recalculate my route. The same is true in my life.
For me, my real inner peace is achieved elsewhere. It comes with quiet, alone time. I think once you can appreciate life's beauty, you can start to appreciate your own inner beauty.
Look how often you refuse to think a positive thought about yourself. You can also refuse to think a negative thought. It just takes practice. And beginning right where you are is a start.