I have the same problem. I have shared that story here. It's not the only thing by far that happened to me in my lifetime. But, I think that was a pivotal moment and I also think it is the reason me and my siblings were put into foster care. I am not sure and the person that turned in my mom and dad has passed away so I can't ask why she did it. I know she was aware of the incident and I know we were taken shortly after that.
So, anyway I think the problem is minimization. When people that are supposed to take care of us don't take care of us and even worse blame us or beat us for crying about an incident where we were abused/teased/bullied it puts us in a mind set that we are blowing things out of proportion. But, as I read your story I couldn't help but think if it had happened in a work setting to an adult woman the man or people in question would be fired. If that didn't happen you would be able to file a claim for your employer allowing a hostile work environment. If you had developed anxiety issues because of that you would be able to get treatment for it and very likely your employer would have to foot the bill. But, as a child your situation wasn't treated as if it was a serious issue. It's very likely though if child protection had known what was going on you would have been removed from your home and for good reasons.
I know my parents didn't lift on finger or make one phone call to protect me or my siblings. Yet, I am the one that feels guilty for not protecting them or myself from the many situations we were in not just ones that were sexual abuse or assault or whatever label fits our situation. Two of my sisters were molested by their foster father I know this because they told my mom and my mom eventually told everyone. Everyone except the child protection agency. I don't think it occurred to her to file a complaint about it. Anyway that wasn't the only or last time she failed or even my dad. It's really hard to say what was the worst all of that or the daily fights that often erupted into violence. Or when we were beaten with a belt. I really don't know. All I know is my body has started to give up the fight and now I will be on medication for the rest of my life.