Demi Lovato performed her single "Confident" at the Democratic National Convention to standing ovation Before the song, she talked about mental illness calling for greater access to mental health care Demi opened up about her struggle with bi-polar condition, substance abuse issues and eating disorders in the past “Like millions of Americans, I am living with mental illness” she confessed. “But I am lucky. I had the resources and support to get treatment at a top facility. Unfortunately, too many Americans from all walks of life don’t get help, whether they fear the stigma or cannot afford treatment”