Faking Normal by Courtney C. Stevens

Alexi Littrell hasn't told anyone what happened to her over the summer. Ashamed and embarrassed, she hides in her closet and compulsively scratches the back of her neck, trying to make the outside hurt more than the inside does.

When Bodee Lennox, the quiet and awkward boy next door, comes to live with the Littrells, Alexi discovers an unlikely friend in "the Kool-Aid Kid," who has secrets of his own. As they lean on each other for support, Alexi gives him the strength to deal with his past, and Bodee helps her find the courage to finally face the truth.