Pretties by Scott Westerfeld (2005, Paperback)

The book is set in the future where mankind has had to make a major shift in how it works since we lost oil. Everyone live sin colonies where at the age of 16 get an operation done to become the epitome of beauty but what is unknown to the people is that there is a secret operation done during this one that changes the way you think. There might not be any wars, fighting, or waste but is it worth it when you cant be you? The series follows a girl who at first all she dreamt about was to become a pretty but after finding out things she didnt want to hear can she follow through with it or follow the rebels who want to live life how it was meant to be.