The 37-year-old says at one point in his life he felt that a life of drinking and violence was the only path for him, but his passion for music made him realise he should change.
The Voice coach told British ShortList magazine: 'The stuff I did was so outlandish that it's hard to articulate it without sounding like I'm glamourising it. I was angry about being an outcast. I would have liked to fit in and have tons of friends, but I didn't. So I'd cut school, drink beer and end up making examples of people.
'After a while I became so comfortably numb with violence I felt that my only purpose in life was to be a rudeboy. So really, music saved my life. I have always said that if I wasn't famous, I would be infamous.'