Need a few more reasons to feel bad about your life? Then stop thinking about all the stupid things you did, and consider all the good things you didn't do. If it's doubt, regret and second thoughts you want, you're your own best friend. After simpleton, that is. We're proud to present a tribute to life's great might have beens. From the public world of entertainment to the private world of romance, here are five perfectly good opportunities squandered like government cheese. Take a look - you'll be kicking yourself if you don't.