go to games and visit Purplebutterfly's Positive Place. There are a ton of affirmations in there.

I think it's awesome that you are determined to increase your self-esteem!! That right that is a positive quality! You are determined. You are setting goals. You are looking out for your health!! Way to go.

If you google yahoo widgets there is a desktop "widget" that will post positive affirmations to you desktop everyday.

What's important is to replace the mental record that says you aren't worth anything, you are useless or any other negative thing that plays through your head. How did those get there? From repeatedly hearing them or feeling them. How to replace them? Repeatedly hear and see and feel the positive. It will take a while to replace the negatives, but you are strong (oh look, another one!) and you can do it. Write affirmations and qualities about you down on sticky note, post them throughout your house or room or work so you see them often. When you see them, make sure you read them. Say them outloud if you can. Say them with a smile.