Someone very wise once told me to look in the mirror and say "hey Hott Stuff, you're looking good today". At first I thought this sounded crazy, but I figured what the heck I'll try it. The first couple times I did it I laughed, and laughing made me feel good. After awhile it became natural, and so did feeling good when I looked in the mirror. Now it feels natural to look in the mirror and feel good! Give it a try!
Never say something to yourself that if you said to others would make them feel negative about theirself.
You are your best friend!