Kiss the Rain — Megan Derr

Selsor's only dream growing up was to be a mage, to bond with a warrior and drive back the monsters in the Territories, live the life his parents had so loved. His dreams falter, however, when he displays no magic despite possessing the ability to use it. Then his dreams are lost when, during an attack by bullies, he lashes out with uncontrolled magic and accidentally kills an innocent bystanders. His jewels are blackened, banning him forever from using magic, and Selsor is thrown out to survive on the streets as best he is able...