Dood nails this one:
by Nathan Bransford
Writing, by its very nature, is a solitary activity. It requires blocking out the world around you, surrounding yourself only with your own thoughts, and swimming and diving through the oceans of your imagination.
It’s also a tremendously time-consuming activity, one that requires blocking off days on the calendar when you would much prefer to be out doing something far easier than pouring your heart out onto the page. You have to focus, power through when the writing gets hard, and above all, make sacrifices to complete a novel.