Blogger Millionaire Mommy Next Door says your but might be too big: you know, the "but I don't have enough time" or "but these things never work out for me" thoughts that keep you from doing things in life. She writes:
Our lives are nothing but the stories we tell ourselves. If you don't like the story your life has become -- tell yourself a better one. Think about all of the things you can do instead of the things you can't. Start a different internal conversation and you'll become wealthy in more ways than one.
Positive thinking does effect our health, capabilities, and happiness levels more than anything else; do check out this whole post for some great photos, and an interesting visualization for exorcising negativity.