She's the best friend a generation has grown up with -- 18-year-old Demi Lovato is the Disney darling with the winning smile. She sang her way to the top of the pop charts and heights of wholesome teen icon status.
Yet Lovato's natural outward confidence in front of the camera could not protect her from the inner, lasting effects of childhood bullying. She sat down with ABC News' Robin Roberts to share her story of a lifetime of struggles. (View photos of Demi Lovato through the...Full Story