Freak by Marcella Pixley
Twelve year-old Miriam is bullyed by the popular girls at her middle school. She is an ugly duckling with a popular, pretty older sister who fails to support her against the bullys. All of the other characters are older than Miriam so I didn't feel the book was too young. I just didn't like anyone in this book, but I think it makes a great point in how to stand up for yourself. So for now, a maybe.