Self Image is what we obviously think of ourselves. I believe that if we project ourselves in a positive way our self esteem is much greater than those that think of themselves in a negative or very destructive way. If we always remind ourselves that we can do anything that our hearts desire then I guess we'll never fail.
I've watched true stories of people where they lost their self esteem and self courage because they view themselves as inferior to others. People around us also can affect how we view ourselves. If you always hear endlessly that you are nothing, worthless, fat that needs to read lipozene reviews and ugly, then for sure our minds will be bloated and polluted with those criticisms.
Notice those people who are surrounded by good words and good moral, they always end up being good and with good values as well.