Robert Pattinson isn't "buff enough" to be an action star.

The Twilight Saga hunk admitted he would prefer to make smaller, gritty dramas rather than take on blockbuster roles because he thinks he doesn't have the physique to be an action hero.

"If there is a way to maintain a career doing small, interesting movies I would take that option. I'm not buff enough for robot movies."

Robert also revealed he lacks confidence in his abilities and isn't expecting anyone to go wild for his latest movie Cosmopolis: "That's my biggest problem, confidence. I'm taking baby steps and hoping people will keep employing me. I can't see tons of people watching Cosmopolis and screaming at it. It would be amazing if they did."