What's one thing you have not done that you really want to do?

I am a successful enough of a writer to make a living from articles and crap jobs but my dream is to be a novelist. I've written three so far and I suppose that my one thing not yet done is get the courage to try sending them out to publishers again. What is holding me back? Two things. 1) The envelope I get in my mail 3 to 5 month later saying "Thank you but not for us at this time but good luck with yourself" and 2) Having to listen to well-wishers and other supportive types tell me how many times J.K. Rowling or Stephen King got rejected before they given a break. Those are literally the two things holding me back from publishing. That no one wants to publish me and that my friends are to supportive.