I got a bad AP score, please help me?

I studied for 3 long months for the AP World History exam. I thought I got a 4 or a 5 on it because it was easy to me. I called AP scoring today and they told me I got a 2. I'm really shocked and really disappointed. I want to apply to schools such as Brown University and Vassar, but those dreams are kind of drowning with this revelation. I'm not sure what I can do about this.