Juliette Lewis says there's a reason she hasn't made her career playing pretty ingenues in conventional love stories.

"Because I'm not perfect-looking, I get asked to play better roles," the 21-year-old actress said in Cosmopolitan magazine's January issue.Lewis' roles have included a virginal adolescent terrorized in "Cape Fear," a quirky, free spirit opposite Johnny Depp in "What's Eating Gilbert Grape?" and a trigger-happy psychopath in "Natural Born Killers."