I am Outcast. The kids behind me laugh so loud I know they're laughing about me. I can't help myself. I turn around. It's Rachel, surrounded by a bunch of kids wearing clothes from the Eastside Mall. Rachel Bruin, my ex-best friend. She stares at something above my left ear. Words climb up my throat. This was the girl who suffered through Brownies with me, who taught me how to swim, who unders…