(Comment of 'peyton' of Slytherin.)
Love yourself fully and truly. If you don't live yourself, you are always going to be a little troubled and that's not being happy. One way i always think about how to choke about this is to meditate. Don't go into some mind abyss. Meditate about everything that you are not at peace with yourself with and come to piece with it. It may not work the first time. Love all your quirks. Live the things that you cannot change because they. Are. You. Be your own version of Luna.