Cameron Diaz believes she has "nothing to prove" as an actress.

Cameron Diaz believes she has "nothing to prove" as an actress.

The Hollywood star - who first shot to fame in 1994 playing Tina Carlyle in
'The Mask' opposite Jim Carrey - is confident in her on-screen abilities
because she has always made her own career choices.

She said: "I don't feel like I need to prove anything to anybody. When you
start out and people identify with you they want to keep you how they
remembered you the first time they fell in love with you. It's like a
relationship. But that doesn't concern me as I've always tried to be true to
myself and move at a pace that was right for me."

Since her breakthrough role, Cameron has starred in a wide variety of films,
including 'The Holiday', 'Shrek' and 'My Sister's Keeper' - in which the
actress played a mother who had to watch her daughter battle cancer.

The 37-year-old blonde admits her role in 'My Sister's Keeper' was one of
her most challenging, but the director Nick Cassavetes was a great help on
set.

She added to Sky Magazine: "Nick was such a great support. He really helped
to guide me towards what was happening because he's been through that
experience himself, with his daughter having a congenital heart disease for
the last 20 years. This material touched me, absolutely. But my character,
Sara didn't have the luxury to feel those feelings. She had to keep
fighting."