The British actress - whose relationship with actor Shia LaBeouf ended in October - feels lucky because she doesn`t have to do anything to alter her appearance if she wants a quiet day out.
She said: "I don`t have to do anything! Hand on heart, I`ve never been stopped in the street by anyone. Ever. No one recognises me, which is great."
However, her apparent anonymity has led the 25-year-old actress having to sit next to people openly criticising her latest movie `Never Let Me Go`.
She revealed: "My life hasn`t really changed. I don`t have to alter anything about my life, really.
"I was sitting in a gondola at Telluride Film Festival with six people who had just watched `Never Let Me Go`. They were having a conversation about it and criticising it and I was sitting there and they had no idea."
Carey - who won the Best Actress BAFTA for her performance in `An Education` - believes it has been her choice of roles that has helped her stay under the radar.
She explained to LOOK magazine: "I think that fame comes with big films where people are playing characters, like comic book movies, and an audience has ownership over that person. For the films I have been in so far, the fan base is different."