Across the Universe by Beth Revis

This is an incredible book! I usually don't like sci-fi, but this was amazing. Amy is leaving everything behind on Earth to go into space with her parents. They will be cyogenically frozen for 300 years on a ship until they are woken up and they will start their own civilization. Amy is marked as nonessential. Her parents are the only reason she's going. One day, after she is frozen, she is unplugged, and begins to melt earlier than she's supposed to. A boy, the next in line to be leader of the ship becomes fascinated with her. But she will soon learn that life on a spaceship is much more different than on Earth, and more surprise is in store. This book includes romance, the battle to understand what is right, and what makes a good leader.