Here is one exercise to begin developing positive self-talk:
Write down some of the negative messages inside your mind. Be specific, whenever possible, and include anyone you remember who contributed to that message.
Next, to those negative messages write down a positive truth in your life. Don’t give up if you don’t find them quickly. For every negative message there is positive, keep looking until you find them.
For example, you might write, when you make a mistake, you think, “I can’t do anything right.” Right beside that negative statement, your positive message could be, “I accept my mistake and am becoming a better person.”
Positive self-talk is not self-deception, positive self-talk is about the truth, in situations and in yourself. When negative events or mistakes happen, positive self-talk seeks to bring the positive out of the negative to help you do better, go further, or just keep moving forward.