Some motivation by Charles Bukowski (on writing, but IMO more general):
if it doesn't come bursting out of you in spite of everything, don't do it. unless it comes unasked out of your heart and your mind and your mouth and your gut, don't do it. if you have to sit for hours staring at your computer screen or hunched over your typewriter searching for words, don't do it. if you're doing it for money or fame, don't do it. if you're doing it because you want women in your bed, don't do it. if you have to sit there and rewrite it again and again, don't do it. if it's hard work just thinking about doing it, don't do it. if you're trying to write like somebody else, forget about it.