Scarlett Johansson wants to direct her own film. The 27-year-old star has been working on her own feature film "for years," and is keen challenge herself.

"I would like to direct a feature. I've been developing it for years. It's good. I just want to work on stuff that's challenging to me, physically, emotionally. I don't want to do anything that doesn't scare me a little bit," she said.

The Avengers actress is looking to play "established" characters in future movies, and she has her sights set on portraying silent film star Norma Desmond in a remake of 1950 movie Sunset Boulevard:

"As I get older I sort of see that I'm able to kind of move away from characters that are transitional. I'm now looking at characters - women - that are established and are where they are because of where they came from and have a background. Actors are always asked to do things that are absolutely ludicrous, whether you're rappelling down the side of a building or crawling through the woods or fulfilling yourself emotionally. I want to play Norma Desmond in Sunset Boulevard someday. But I need a couple more years."