Successful people maintain a positive focus in life no matter what is going on around them. They stay focused on their past successes rather than their past failures, and on the next action steps they need to take to get them closer to the fulfillment of their goals rather than all the other distractions that life presents to them.
By taking the time to stop and appreciate who you are and what you've achieved - and perhaps learned through a few mistakes, stumbles and losses - you actually can enhance everything about you. Self-acknowledgment and appreciation are what give you the insights and awareness to move forward toward higher goals and accomplishments.
It's not an accident that musicians become musicians and engineers become engineers: it's what they're born to do. If you can tune into your purpose and really align with it, setting goals so that your vision is an expression of that purpose, then life flows much more easily.
One individual can begin a movement that turns the tide of history. Martin Luther King in the civil rights movement, Mohandas Ganhi in India, Nelson Mandela in South Africa are examples of people standing up with courage and non-violence to bring about needed changes.
Acknowledging your mistakes also has its pluses, but we often don't have trouble recalling or mulling over those. The point is, if you don't acknowledge your successes the same way you acknowledge your mistakes, you're sure to have a memory full of blunders.
For the first ten years after I got out of graduate school, I studied success. I read every book I could get my hands on and took every training I could find, and that allowed me to become an expert in this area. I learned how to create high self-esteem and success in my own life and in the lives of others.