Am I sexy?

15year-old Mareike lives with her mother, her sister Franca and her brother Tim in a Mannheim suburb. She dreams of being a model. But she hasn't got the money for the expensive training. Moreover, Mareike is a bit too chubby for this job. Nevertheless, she is absolutely determined to make her dream come true. But when her hair begins to fall out and an autoimmune disorder is diagnosed, the teenager's world just caves in ...