I come from a really big family, my father was a businessman and what he always instilled in us was to be your own boss. My father built up his business, and he was by no means a rich man, but he figured out how to work four-and-a-half days a week.
Writing is communication, and you don't know how you're doing until you put it in front of someone else's eyes. You also learn from critiquing other writers' work.