Selena Gomez’s new documentary, “Selena Gomez: My Mind & Me,” gives viewers a candid look at her life, beginning in 2016 and spanning to present day. In the Apple TV+ film, which is out now, the 30-year-old singer opens up about her career, her mental health, and her relationship history. Overall, it’s a sharp and moving portrait of a child star turned major celebrity who’s gone through so much in her first 30 years of life. Ahead, we’re breaking down the biggest revelations from Gomez’s…