Willow by Julia Hoban

Seven months ago, Willow, a girl with only a driver's permit, on a rainy March night, was responsible for driving home her drunk parents. But they never made it, Willow lost control of the car, and both her parents died in that accident. Willow is now seventeen years old, and she's living with her older brother, sister-in-law, and her 6-month-old niece. Ever since the accident, her brother can barely speak to her in a full conversation. Leaving her parents home, her friends, her school all behind. Willow has found a way to torture herself that she's the one that killed her parents- without anyone knowing that she's cutting herself  except Guy, a boy that is sensitive as she is. When Guy finds out about Willow's secret, he wants to pull her out of her numb, and torturing world she created for herself. Guy wants to know why she is doing all this, she told him she is doing this because she realized two things. The first is that the emotional pain was going away, it wasn't going to consume her. And the second was that she was stabbing herself, really attacking herself with a screwdriver, a razor, or even a stash and that the physical pain that she was causing for herself was better than the drug they gave to her in the hospital. That pain, that physical pain