The Worst Fear in My Life At the Moment

I unconsciously think and act like my individual existence is more important than any other. I've done nothing significant in my life (cured cancer, wrote the Great American Novel, etc.), nor have I ever had a thought that was original or at least helpful to someone. And yet, I live my life as if I were on the verge of some big break, as if I were on the threshold of fulfilling some great potential that will be both impressive to the layman and beneficial to the world for generations to come.

Beneficial is an entirely subjective term. Am I going to do something that benefits the world in its current manifestation (as my own finite mind understands it)? Or will I leave something that is more beneficial to future generations? Do great people think like this, or do they just get to work doing something they feel called to do, something they consider higher than themselves, and let the cards fall where they may?

Perhaps I've set my sights too high. No matter. I intend to die trying. Trying to do what? Apparently I'm not supposed to worry about it.