A woman molested as a child has held back tears as she stood on the steps of Victoria's state library recounting her abuse at a rally calling for an end to violence against women.

Amelia told the 50-people gathered in Melbourne CBD on Saturday she had been abused, assaulted and raped about age five by a male neighbour in his late teens, and the justice system had failed her.

"Within a few hours, my parents had called the police to report the assaults. However, the police's recommendation was not to pursue and so no investigation took place," she said.

"They didn't even deem it important enough to report it to child protective services, or to record the event.