The challenge in this is that rarely will you ever do anything that is not consistent with your self-image because it sets the limitations for your life. The money you earn, the people you have in your social life, and your occupation are all largely determined by your self image. Even the person you choose to marry is influenced by your self-estimation.
I will bet that most of your life is good, but it can always be better. Confronting the issue of "being better" often brings you face to face with the limitations put in place by your self-image.
For example, there is a well-worn story about a salesman who, regardless of the territory he was given, whether poor or wealthy, always earned $15,000 dollars a year. Why? Because his self-image was that of a "$15,000 dollar salesman." This illustrates the idea that a person will not do anything that is not consistent with their own personal evaluation.
So I ask you, how many dreams have you given up because your self-image sabotaged you?
Where is it that you feel unworthy? Do you feel like a victim of life? Would you like to ask for a raise but deep down don't feel worthy? Do you wonder why you always attract losers into your life? When you look in the mirror, do you find yourself focusing on the places that are a disappointment to you? All of these are the results of a negative self image.
My advice. GET ANGRY!!!! Think often and hard about the idea that what you think and feel about yourself is for the most part borrowed nonsense.
Motivate yourself to change your self-image by recognizing that people respond to what YOU think about yourself! You can literally change everything by changing your self-image. Remember, you are the primal moving force in your life. Move it! Move it! Move it!