I am Number Four by Pittacus Lore Lorien Legacies series, book 1
Summary: In this young adult novel, set in rural Ohio, friendships and a beautiful girl prove distracting to a fifteen-year-old who has hidden on Earth for ten years waiting to develop the Legacies, or powers, he will need to rejoin the other six surviving Garde members and fight the Mogadorians who destroyed their planet, Lorien.
Summary: Extraordinary teen John Smith is a fugitive on the run from ruthless enemies sent to destroy him. Changing his identity, moving from town to town with his guardian Henri, John is always the new kid with no ties to his past. In the small Ohio town he now calls home, John encounters unexpected, life-changing events-his first love, powerful new abilities and a connection to the others who share his incredible destiny.