There is a rule in competitive games: It's not over until it's over. As long as the game is still going, there is a chance that someone who started out not doing so well can "make a comeback" and do much better.
The same applies to living life: It's not over until it's over. As long as you are alive, you have the opportunity to do more and be more.
As you know, your own self-image is based on what has already happened in your life, what you have already done, and how you have already acted. As long as you are alive, you can choose thoughts, words, and actions that will greatly elevate your self- image.
You might complain about your self-image because you view your current self-image as a final reality. It isn't. We human beings are works in progress as long as we are alive. If you aren't satisfied with your self-image right now, say and do things that will raise your self-image.
(From Rabbi Zelig Pliskin's book: "Building Your Self-image and the Self-image of Others" (Artscroll) Chapter 77)