If you're doing something like 'Arcadia' by Tom Stoppard, which has been done millions and millions of times, and it's been played some unbelievably well-respected actors, there's a lot more pressure there. But I try not to think about all the other people who have done it before me. You've got to try and be original.

Movies make teenagers have quippy answers for every question. Nothing seems to faze them, and they're like, 'Oh, whatever.' You're not like that when you're a teenager. You're really earnest. Things really feel like life or death. And you kind of oscillate between emotions at one time. It's very emotionally draining being a teenager.

'Diary of a Teenage Girl' was my first American movie. It was my first movie in an American accent. It's based on a graphic novel, which was written in 2002 by someone called Phoebe Gloeckner. It was turned into a play by Marielle Heller, who then wrote it as a screenplay for Sundance Labs.

Bel Powley Quotes