JoJo always assumed she was too “strong” to struggle with addiction. The 33-year-old pop star abused alcohol and substances as a young adult, after her parents – her mom Diana and her late father Joel – both struggled with addiction for many years. Speaking to PEOPLE, JoJo explained: “For a while, I was super self-righteous and thought I’d never be like my parents. I was like, ‘No, because I’m the strongest. I’m wicked strong.’ “But then I was like, ‘Oh, what I’m doing is no better or worse. I’m my parents’ child, and I need to be awake to what’s happening within myself.'” JoJo – whose real na…