She was abused as a child. Her parents dressed her like a boy, cut her hair like a boy, and basically treated her and raised her as a boy in a very remote region of Canada where she couldn't have a normal social life.

https://www.thelist.com/149804/the-stunning-transformation-of-ellen-page/

She's the victim of child abuse. Girls don't naturally grow up wanting to be boys in a healthy family with a healthy and sane mother and father.

To make things even more weird, she's only 5'1" and very petite. She'll never pass as a man. She can pretend to be a petite little boy. Perhaps that will attract a pedophile.