Can't Start!

[Azunite]

I have everything all set! It is a fantasy story set in old ages, including magic.

Background Story
Characters
High information about characters and their relations
Locations
Highly detailed backgruond information about Locations
History of the Land
Lay of the Land (I drew many maps)
The Storyline
I can show the storyline on the map
What will the characters say, when and how.

I even composed some music ( piano ftw ) for some epic moments in my story!
But I just can't start it!
If I start it, I will write without stopping but I just can't
WHY ! =?

[scuba steve]

Generally novalists right the end of their story first, so they know how to stop and build it up appropriately... Writers block sucks :P