London, Jul 23 (IANS): Actress Cameron Diaz says even at 37, she feels like a teenage boy at heart.

"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," contactmusic.com quoted Diaz, 37, as saying.

Diaz who has just finished filming "Bad Teacher" alongside ex-boyfriend Justin Timberlake admits Hollywood gives actors their freedom to be themselves and not pretend.

"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.

"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 added.