I had to go through my list and get rid of the self-defeating ones.

Don't write: I am one of the best people in the world.
Do write : I am the best that I can be, and getting better everyday.

Don't write: Today I am on top of the world.
Do write : Today I am on top of my life.

Okay maybe not great examples but I hope you get my point, which is just to keep your affirmations rooted in reality so you can really believe them.