Cameron Diaz is a boy at heart

London: Hollywood star Cameron Diaz still feels like a "14-year-old boy" at heart even though she is rated as one of the world`s most beautiful and successful actresses.

Although her life is now completely different, the `Knight and Day` actress, who shot to fame at the age of 21 when she starred alongside Jim Carrey in `The Mask`, insists deep down she is still the same person she used to be. "I`ve certainly grown up. I`m much more mature than I used to be. I`m still a 14-year-old boy at heart but my life is totally different to how it was when I was 27," She explained to Stylist magazine. The blonde beauty, who has just finished filming `Bad Teacher` alongside ex-boyfriend Justin Timberlake, believes the people who act like jerks when they become famous aren`t necessarily changing, but have always been that way. "I think what happens in Hollywood is that people don`t change much. I feel like people become more who they really are. That`s what fame does - it will only bring out in you what is truly within you," she added. "Two things happen when you become famous. One: every door is open to you, so it is your choice to know what your boundary is. Two: you have to be accountable for what you do. You either live right morally in this business or you don`t," she said. PTI