The 46-year-old actor got into drugs fours years after his parents divorced, reported Aceshowbiz.
"I remember just lots of turmoil from that time period. I was having a lot of troubles with cocaine... I was hanging out with some pretty rough characters. I was scared to go to school (because) one of them wanted to kill me. I wanted to get out of there," Jack said.
The "School of Rock" star felt he had no one to turn up to in the family and decided to confess everything to the school therapist.
