Self-esteem is as necessary to the spirit as food is to the body.
Worry is one of the most destructive scourges of mankind.
Admit your mistakes but don't cry over them. Correct them and go forward.
Happiness is simply a state of mind in which our thinking is pleasant a good share of the time.
Your present negative beliefs were formed by thought PLUS feelings. Generate enough emotion, or deep feeling and your new thoughts and ideas will cancel them out.
To change a habit, make a conscious decision, then act out the new behavior.