In a recent interview, Megan Fox talks sex appeal, motherhood and feeling like a pin-up girl.

"No one believes me when I talk about this, but I'm really maternal," Fox tells W Magazine, due on newsstands this week.

But she adds, "I worry that because I've always wanted [kids] so much, as the world goes sometimes, I won't be able to have them, even though I would be able to provide them with such an amazing environment."

The actress, 23,  also reveals her fears about her rival females in Hollywood, "I don't trust people in this industry, but I especially don't trust girls in this industry, because it's incredibly competitive, and I'm just not interested," she says.

After being nominated with a RAZZIE award for  "Worst Actress," Fox says, "My main weakness is nerves. I have no confidence, and because of that I'm always second-guessing myself."

However, she admits that her sex appeal as an Armani model raises her confidence level, "There are some women you could put in underwear and photograph them, and it looks really classy and it doesn't necessarily provoke a pinup image," she says.

"But with me it does, immediately, as soon as I'm in underwear. I'm a Vargas girl," she adds, referring to Alberto Vargas, the famed Peruvian painter of pin-up girls.

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