Those days you think about not writing, or not drawing or not dancing, acting, playing music...whatever your niche is, then I hope you think about Tyler Perry.
Check out Tyler Perry on wikipedia and you'll see that he wanted to be a playwright. He moved to Atlanta in 1992 and produced his own musical using $12,000 dollars of his own money. It bombed. He went on producing it for 6 years. At one point he was even homeless. His mother was concerned. People told him to quit. He kept making changes and trying again and now...he's considered one of the most successful media moguls on the planet.
He has been told his movies are not made for Hollywood success. He has bee told there is no genre for his style of movies.
He earned $75 million between 2008 and 2009.
I am guessing he is glad he stuck with it back in 1992 (and the six rough years that followed)