The young Brit gave up alcohol last year (11) after realising he wasn't much fun when he was drunk.
He tells Parade magazine, "I've worked with Richard Harris, Gary Oldman, all those actors who went crazy when they were young, and I always wanted that. The idea of that kind of life and chaos was always so appealing to me.
"Unfortunately, the way I do it, there is no romance to it. There is nothing glorious or triumphant about it. It was pathetic, boring, and unhappy."