Successful design is not the achievement of perfection but the minimization and accommodation of imperfection.
A part of my kind of design and inspiration ethos is that I carry around a leather notebook and I sketch in it, doodle in it, write notes in it, and I put pictures in it.
If you don't design your own life plan, chances are you'll fall into someone else's plan. And guess what they have planned for you? Not much.