Love yourself. No really, love yourself like no other. You are the most important person in your own life. You have to take incredible care of your well being. The food you eat, the way you sleep, how you think, and who you allow yourself to hang out and associate with are all reasons why you will live a fruitful life, or a life of misery and mediocrity.
The love you have with yourself is a love you never want to let die. If it does die, you become extremely vulnerable to living solely to impress others, and that never leads to success.