"It's never too late to become what you might have been."
I often think of stories of Bukowski, J.K. Rowling and others to get the fire lit under me, and not to wallow too much in self-defeating thoughts, which I have had a tendency to do at times in the past.
Check this out!
http://getbusylivingblog.com/its-never-too-late-for-success-even-in-your-40s/