Self talk is very important in the pursuit of positiveness. You just shouldn't listen to your self talk in your head, sometimes you need to communicate back clarifying how you feel.
Here is a note I wrote to my core self.
"Today, I will no longer allow others to define who I am. I will become mindful of the difference between me in the moment and the me of the past who only resides in my memories. I will know that my past thoughts, actions and feelings were a result of hurt done to me, and definitely were not my fault. Therefore I am no longer going to own them. I will believe strongly me and my positiveness. I will accept all that I am now. I will remember that my experiences flow like a river and in a moment all my experience turn into history. My goal is to recognize and totally accept my core self, my authority and appreciate me daily."