One of the challenging things in life for some people is realizing that there are boundless opportunities. I guess it must be part of human nature for us to devalue our other capabilities, and sometimes aimlessly focus on that which is not attainable. There is a line between realistically stretching yourself, and foolishly attempting to do something which brings you, and all your other capabilities down.
So we have to choose our battles wisely, as we pursue our goals in order to win the war in whatever area of life we are faced with challenges. We can do it Olympian style...let us focus on excelling in the little things we do everyday, and one day we will realize that all those little things we did finally amount to something big and wonderful. Moral of the story: Take a step at a time!