Bella Ramsey spent many teenage years working with adults so never really went through the moody, rebellious phase often associated with being a teenager.

The British actor, who debuted in Game of Thrones aged 11 and uses they/them pronouns, says they had consciously decided not to behave like a stereotypical teenager after hearing criticisms from adults.

"I was like, I'm not going to be that."

So when Sunny Dancer, a film about a summer camp for young people affected by cancer , gave Ramsey seven weeks to experience teenage freedom, it was an opportunity to dive straight in.

"I got to be a teenager aged 21, which was brilliant," Ramsey tells BBC News. "It was really nice - and liberating."

Looking back, Ramsey says the experience made them wonder whether they had missed out by being quite so sensible the first time around.

"I kind of wish that I had made the most of being a teenager and getting away with things and being a bit rebellious."

In Sunny Dancer, Ramsey plays Ivy, a young female cancer survivor in remission who reluctantly heads to a "chemo camp" where she finds an unexpected group of friends and has a summer that changes her.