Demi Lovato thinks it's "okay to have a mental illness". The singer has been dealing with bipolar disorder for several years and has, therefore, launched her own campaign aimed at tackling the negative stigma against mental illness. She said: "I just think mental illness is something people need to learn more about. "I want people to know it's okay to ask for help and it's okay to have a mental illness." The chart-topping performer explained that her father, Patrick, suffered from similar illnesses before he passed away in 2013. She told PEOPLE magazine: "I watched him live a very unfortunate life because of the lack of access to treatment." However, the 'Heart Attack' singer revealed she's doing well in her own battle against addiction and mental illness. She said: "I'm doing really well. I'm successful, but most importantly I'm healthy and happy, and I do not let my disease define who I am."