Here are some samples of Positive Affirmations you can use to improve your daily life.

I use this one daily just to improve all aspects of my life.

"Health, Wealth and Happiness are mine now"

You can either say it in your head or speak it out loud. You are basically training your subconsious to think positive instead of negative. If a Negative thought comes into your mind cancel it out with something positive. Try it like i have said before for a few minutes day or even through out the day when your mind is not distracted.