The British star - who is married to Daniel Craig - has enjoyed an impressive career, starring in Hollywood films such as `The Mummy`, `The Lovely Bones` and `The Fountain` but doesn`t think acting was a natural calling for her and admits she is more reserved in her work than everyday life.
She said: "I wasn`t so much a shy child, but I was shy aboutacting. I wasn`t the sort of kid whose mother would put her up on the table and make her do a dance for everyone. I wasn`t the star of the school plays.
"I was generally very shy of performing. I wasn`t a `performer`. I`m still not really like that, I don`t think. I don`t have that `jazz hands` thing in me."
Despite her hang-ups, Rachel - who has six-year-old son Henry with former partner Darren Aronofsky - won a Best Supporting Actress Oscar for her role in `The Constant Gardener` but can`t remember much about the evening of her win.
She told Empire magazine: "It`s a completely surreal experience. Every actor has a fantasy that It will happen, but you don`t believe it will. I`d never been to the Oscars before that night. It`s really a big, hazy blur. I was so vastly pregnant at the time, I couldn`t go and get merry with people."