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She's frequently compared to Angelina Jolie -- so Megan Fox wants to be a mother too, naturally.

"No one believes me when I talk about this, but I'm really maternal," the actress says in the new issue of W.

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"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," Fox, 23, says.

The "Transformers" star adds: "And you know, the people who hate kids and don't want kids always end up having 50 of them."

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Fox does have a child in her life, however: Kassius, the seven-year-old son of her boyfriend actor Brian Austin Green.  Although she and Green (together for five years) recently called off their engagement, they remain together, and share a home with Kassius.

The star -- recently Razzie-nominated for worst actress of 2009 -- confides that "I have no confidence, and because of that I'm always second-guessing myself." For fear of reading harsh reviews of her acting and off-the-cuff comments, she avoids going online.

RELATED: Check out the Megan Fox style profile!

Save for a high school friend back in her native Florida, Fox counts few female friends -- especially within Hollywood. "I especially don't trust girls in this industry, because it's incredibly competitive, and I'm just not interested," she says.

More on Usmagazine.com:

Check out Megan Fox working the "peek-a-boo bra" trend

See how Megan made a recent best-dressed list

Megan vs. Angelina: check out their similarities in our slideshow