Uglies by Scott Westerfeld

Becoming Pretty is what all the Uglies look forward to. When you become 16, they give you surgery, and BAM! You’re a Pretty! Tally Youngblood can’t wait to be a Pretty so that she can join her best friend forever, Peris, and have a great life. When she meets Shay, a prankster and risk-taker like her, her want for becoming a Pretty wavers and causes her to hesitate.