Fat Kids on Fire by Bekah Brunstetter

Back at home, Bess is just another angst-ridden teenager trying to fit in. But this summer, things are going to be different. Campers and counselors alike are automatically drawn to the new skinny fat girl who's a definite shoo-in for the illustrious title of Camp Princess. Popularity, power, and self-worth get mixed up as Bess struggles to find her identity. Will she return to school a new woman or will her new self fade like the summer? Colored with sweat stains, stashed sweets, and the awkward innocence of first loves, Fat Kids on Fire is a candid telling of fitting in, living big, and feeling small.