We all know that girl： The one who comes into school smiling， laughing and high-fiving her hundreds of friends. You'd almost swear she has cartoon birds singing to her as she walks through the halls. She's just ... So. Damned. Cheery. As you slump1） into the seat next to her， all you can think is： What does she have that I don't？ We'll tell you： a positive outlook. And we're not just talking about looking on the bright side every so often2）. This is about having a constantly optimistic mindset3） and believing in yourself no matter what. Here are five sunny secrets that'll make you want to jump for joy.endprint