United Kingdom, April 19 -- Sadie Sink thinks she was a "mature" child star.

The 23-year-old actress was just 10 years old when she played the title role in the Broadway revival of 'Annie' and then found global fame when she was cast in the Netflix hit 'Stranger Things' in 2016, and explained that she has tried to bring her "untraditional expderience" to her new role as tearaway Shelby in the play 'John Proctor Is the Villain'.

She told AccessHollywood: "I think there was a certain maturity in me that I carried at a young age and I definitely subconsciously carry that into the role of Shelby. My experience was very untraditional, but so was Shelby's and I've found ways to marry the two."

In the play, Sadie stars as a high school studen...