As half of the two Coreys, Feldman was one of the hottest teen stars of the '80s. But while filming "Stand By Me" at 14, he started drinking and smoking pot. "There was a lot of pain in my life," he later told People. "As a child, my life was hell. I had no friends because I was the geek, the outsider. I was told I was fat. I was told I was ugly. There was mental abuse and physical abuse -- anything you can imagine. I was beaten with sticks, toilet seats." At 15, he legally emancipated himself from his parents, which gave him more freedom to do what he wanted. Soon, he was getting into heavier substances, and in 1990, the 19-year-old was arrested for possession of cocaine and heroin. It took two more drug-related arrests for him to check into rehab in 1991.