The job of writing is a study in the art of discipline. A real job is a task you are required to perform every day so as to get a paycheck. Writing is a self imposed sentence, testing your resolve and your talent. Then you must give yourself away, a sentence at a time. The reward you get for all of this? Mostly rejection and criticism. So what sustains you? If you are financially successful, the answer is obvious. If you are not then why perservere? A good question, I can speak only for myself. No choice.
You are sitting at a bar and you see a pretty little vampire with tattoos enough for Van Gogh to take the same ink and create a masterpiece. Then, through no conscious volition, the vampire girl sparks a conversation in your head where the girl is part of the book you are writing and she is the victim of a perverted psychopath, and she is venting her hatred and her hopes through the symbolism and story stained on her skin. A character you created three years previous in a short story springs to her rescue and the seed to a new novel is planted in your brain, there to thrive or to die. None of this has anything to do with you. You are just sitting, having a beer and wishing you were thirty years younger, so you could find out the part of the tattoo story that lies under the shirt the vampire is wearing. But now you got this story in your head.
Being a writer is not a choice. Being a good writer is a matter of discipline and talent. Being a successful writer, in modern times, demands you be a business person as well. So far, I am just a writer. I will keep you posted.