Many years of writing and teaching taught me one thing I'm willing to call a Universal Truth for the writing community:
You are unique--ONE of a kind. No one but you could have written your book. No one but you has had your experiences, your genetic heritage, your exact thoughts.
The same goes for me.
No one on earth but I
Could write Faust's Butterfly.
It's not that I have a more fiery imagination or higher intelligence or more drive than anyone else. It's just that no one else had my teachers, my parents, my acquaintance with the weird little spot on the map known as Orange County, Indiana, and my propensity to record certain kinds of details in writing.
All of us here are in the same position regarding our books. All that we are and have been and have experienced is in them.
CHERISH YOUR UNIQUENESS. In the activity of writing, it's one of your most valuable possessions. 
Bill
Spot on as always. We are each of us unique and we should celebrate the fact.