Writing, for all that it's harder than nursing ever was, is also more joyous and more fun and a lot less dangerous. And the major themes of my life have become the major themes of my writing, too - so it has all worked out pretty well.
Don't talk about writing. Write. Don't show unfinished work to anyone. Don't show finished work to non-writers. Get your opinions, not from friends and family, but by sending your work out to editors. An endless stream of rejection slips means you need to learn more. So learn more.