John McPhee offers a number of clues in he latest New Yorker. Two of my favorites: Realizing you’re not alone in your despair, and a way to find the word you need. His take on the first:
If you lack confidence in setting one word after another and sense that you are stuck in a place from which you will never be set free, if you feel sure that you will never make it and were not cut out to do this, if your prose seems stillborn and you completely lack confidence, you must be a writer. If you say you see things differently and describe your efforts positively, if you tell people that you “just love to write,” you may be delusional.
The New Yorker has erected a tall wall blocking non-subscribers, so the link above will only get you a taste. But you may find that enough to send you to the news stand to buy a copy or to subscribe online.