Are We What We Write?

                  Why are there writers?
Better question;  
What makes a writer write the genre that they do?
Do they choose the genre? 
Or does the genre chose them?

     As for me, I’m not sure why I write. I never thought about.
I do remember reading voraciously when I was a teenager. 
For years after that, I read a lot. 
What I read changed over the years. From Louis L’Amour Western, to Science Fiction and Mystery. The Grand Dame Of Mystery; Agatha Christie, to Sherlock Holmes. And many in the middle.
    But that doesn't explain why I or any other writer  writes the stories the do.  Some  deliberately choose what genre, and/or style or type of material they write. Some just write what feels right to them. They write the stories they can’t find.
Where my stories come from, I have no idea.  Save that some come from a title that idea that clicks when I hear it said, usually in conservation, or on TV,  or other media. Some from a general idea I have in the way-way back of my mind, It may or may not be fully formed, I will form it as I put the words on “paper”.
On rare occasions, I have a definite idea of exactly  where I want a story to go, but most of the time not so much.
Many of the same questions come for writers at the end.
Do they choose the ending or does the ending choose itself?
Ask ten different writers, and you will probably get ten different answers. Although the themes of the answers will probably be similar. 
     What a writer will write on any given day is up to them,
Or at least, he thinks it is.