Opinion By Barbara Presnell I am not one to sticker up my car. Despite how freely I seem to share the vulnerabilities of my life, I don't want them on display. So, I keep my window glass clean and my opinions to myself. But when my friend gave me a bumper sticker at Christmas, I surprised myself by not thinking much before peeling off the back and centering it on the rear window of my SUV. "DON'T POSTPONE JOY," it says, in bold, blue letters.