Collin Kelly & Jackson Lanzing 
Joyride #1 [EPUB ebook] 

In the future, Earth sucks. The stars have been blocked out for so long that people have forgotten there was anything else besides the dumb World Government Alliance watching over them, training children to join the militarized Allied Youth and eliminating all resistance with a giant ray gun. Uma Akkolyte is a girl who shoots first and leaps before she looks, and when she gets a strange message from outside the barricades of Safe Sky, she jacks a spaceship and punches through the stratosphere with an unlikely crew of teens who are totally not ready for what they’re about to find.