London: "Lost in Translation" star Scarlett Johansson says she is keen to direct a film.

The 27-year-old actress has been working on her own feature film for years, and is keen challenge herself, as reported.

"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," Johansson 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," she added.