Boost your self-esteem by being flexible. Thus if you are ready to do what it takes and keep changing your behavior when it is not achieving your wants, you will get whatever you want.
Children are excellent at being flexible.
It is because of this flexibility that they always manage to eventually wear us down and they get what they desire. Now in this case I'm not suggesting that we throw tantrums or scream our heads of. The point is to know your goal. Take an action. See if the action is taking you nearer to your goal.