It's easy to get negative because you get beat down. You go through a few disappointments and it's easy to stay in that negative frame of mind. Choosing to be positive and having a grateful attitude is a whole cliche, but your attitude is going to determine how you're going to live your life.
See, when you drive home today, you've got a big windshield on the front of your car. And you've got a little bitty rearview mirror. And the reason the windshield is so large and the rearview mirror is so small is because what's happened in your past is not near as important as what's in your future.
Don't ever criticize yourself. Don't go around all day long thinking, 'I'm unattractive, I'm slow, I'm not as smart as my brother.' God wasn't having a bad day when he made you... If you don't love yourself in the right way, you can't love your neighbour. You can't be as good as you are supposed to be.