]I am pretty sure that JK Rowling back in her council flat and on benefits when she started the Harry Potter phenomenon would not have believed the success that awaited her... just go for it and write it before you expend your last breath
Why do you assume that, Gary? I know plenty of (as yet) unpublished writers who are utterly convinced that great fame and fortune await them.
I certainly believe that everyone should write from the heart. On the other hand, no one just happens to get published, fate doesn't step in and do it for you, you have to acknowledge that you want it and then go out and make it happen.
When I first became serious about my writing, I made a decision: if I wanted to become a published writer, I had to work at it with the same dedication and commitment as if I were already there. While I wasn't going to put on airs and go around telling people, "Oh, I'm a writer," I had to think of myself that way, believe it, and pursue it.
Since then I have become more convinced than ever that if you want to succeed, you have to put your heart into your writing AND your writing career at the same time.
Give yourself that excuse that "I may never get there," and you'll never give it your best effort.