Miranda McKeon has opened up about her battle with stage three breast cancer, a rare case doctors of the 19-year-old actress described as 'one in a million,' due to her age.

The actress chat with

The Anne with an E star said she had 'brushed across a lump that [she] hadn't felt before' last month, and 'immediately went to the worst case scenario' in her thinking.

'This is the moment where everything changes and there's no going back,' she said. 'But after going down a little Google rabbit hole, my mind was at ease because I didn't think anything could be wrong because of my age.'

McKeon, who played Josie Pye on the Netflix series, said she subsequently received an ultrasound and biopsy from doctors, who informed her on June 14 that her biopsy 'came back positive.'

McKeon said receiving the news was 'surreal,' and that she swiftly scheduled appointments for multiple procedures on the medical front, such as meetings with oncologists and surgeons, mammograms and ultrasounds.

'My doctor was like, "Your stage doesn't define you. And your cancer is your cancer,"' she said. 'Which I appreciate because when you hear someone's stage, your mind goes straight to one place or another and I don't think that's necessarily representative of what I'm going through.

'Although I don't have the easiest case scenario, like I wish it hadn't spread to my lymph nodes or that it was a little less complicated, I never had a moment where I was like, "Oh, am I going to die from this?"' she said. 'That was never really a thought. I think this entire time it's been more of like, "Okay, we're going to treat this and solve it."'

McKeon said her course of action on her health battle calls for a four-month chemotherapy regimen with radiation, with surgery looming as an option.

McKeon said she 'realized that having breast cancer as a young woman involves a lot more factors than just treating the cancer itself,' as she has explored the option of freezing her eggs in the early goings of her health battle.

McKeon told the outlet that she is 'managing as best' as she can in the week after her initial chemotherapy treatment last week.