(CNN) As she battles cancer for the third time, Olivia Newton-John is not focusing on how much time she may have left.

The 70-year-old singer and actress sat down with "60 Minutes Australia" to talk about living with stage 4 breast cancer.

"When you're given a cancer diagnosis or a scary honest diagnosis, you're suddenly given a possibility of a time limit," she said.

"If somebody tells you, you have six months to live, very possibly you will because you believe that," Newton-John continued. "So for me, psychologically, it's better not to have any idea of what they expect or what the last person that has what you have lived, so I don't, I don't tune in."

The beloved star was first diagnosed with breast cancer in 1992 and again in 2013, but chose to keep that battle private.

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