The 23-year-old actor, in an interview with New York Times, said she used to be "infuriated" with the questions she was always asked when she was a child.
"It may have taken me a while to see how dynamics on set weren't fair. But I've always known, from the age of 12, that I was being asked different questions by interviewers than men: 'Who's your celebrity crush?' 'Are you putting on all the dresses?'" Ronan said.
"All about image and crushes. That always infuriated me," she added.
"A lot of women think a job like director, which is so authoritative, is one where a woman can only succeed so much," she said.
"It's only watching Greta that's changed my perspective on what I might achieve. And I've always thought of myself as a confident person," she added.