"I can be a pretty good aunt, but whether I'm a good aunt or a crappy aunt is really not remotely the same question as me being a good parent or a crappy parent," Diaz, says in the July issue of InStyle magazine, on newsstands Friday. "It doesn't quite have the same impact."
The Knight and Day actress, 37, says she considers her family "the most important thing to me" – but she's thrilled with her life just the way it is and doesn't necessarily see kids in her future.
"Having children changes your life drastically, and I really love my life," she says. "Children aren't the only things that bring you gratification and happiness, and it's easier to give life than to give love, so I don't know. That kind of change would have to be either very well thought out, or a total mistake – a real oops!"
Diaz, who has most recently been linked to New York Yankees star Alex Rodriguez, is much less forthcoming when it comes to discussing her romantic life.
"It's one thing when I answer questions for myself – it's another thing when I answer questions and someone else is involved," she tells the magazine. "It's not fair to the other people in that equation."
For more from Cameron's interview, visit InStyle.com