I was sure I'd be Susan. I come from a family that matches the Pevensies (boy-girl-boy-girl) and I'm the Susan. According to the quiz, this is a better outcome:
You are Prince Caspian, who became the rightful heir of Narnia. You have a sharp eye for injustice and a humble heart to improve the world around you. You never quite rely on yourself to make changes; instead, you believe only teamwork can achieve them. As you grow in wisdom, you will learn to trust yourself.
Take the quiz here.