"It's so much more work to have children. To have lives besides your own that you are responsible for -- I didn't take that on," the actress told Esquire. "That did make things easier for me. A baby -- that's all day, every day for eighteen years."
Diaz, 41, said that while she does not have any regrets regarding her decision not to be a mother, the choice was not an easy one. She did note that though she does not have kids, she can have motherly instincts.
"I like protecting people, but I was never drawn to being a mother," she said.
In previous interviews, she has said she sometimes feels like a mother, since many of her friends have children and she spends a lot of time around them.
Diaz's full interview will appear in the August issue of Esquire, which will appear on newsstands July 8.
Notable deaths of 2014 [PHOTOS]
Polly Bergen, Emmy Award-winning actress, dies