You are... Luigi, the under appreciated!
You don't quite get it. You are smarter, fitter, and bolder than your potbellied brother ever could hope to be, yet he gets all the fame, fortune, and glory, not to mention Peach's heart. If only you were the first player in Super Mario Bros... things could have been different. Maybe you can make a comeback, now that you finally have your own game.. but probably not. After all, you're just Luigi.