A year ago, the idea of me completing a marathon was laughable. It was an impossible goal. Through lots of little successes, training hard, and learning to finish, I made it through 26.2 grueling miles. Now I am training to do it again.
Find something in your life that you think you could never ever do. Something really hard. Don't pick something that requires alot of luck or connections, like becoming a pop star. Pick something that is tough to achieve because it takes hard work. Speaking in front of a crowd of 200. Running 5 miles. Losing 25 pounds. Finishing school. Find something, then knuckle down and do it.
Funny thing about doing the impossible, it makes everything possible.