Hi @Evie1 and shout-outs to @outlander @Maggie @Former-Member and special waves and welcome hug to @FreedomRoad 
I understand exactly where you are Evie. I'm so sorry this happened to you and how it's affecting your life. You have friends on here to help though, so that's a huge plus.
What is forgiveness? A generalised word that probably doesn't mean much except to put pressure on victims to be more than what's humanly possible when we're at our most vulnerable. It's a part of recovery yes, but it comes much, much later after our brains and nervous systems start to heal.
Forget about forgiving, guilt, shame and the why's for now and focus on your feelings because trying to be rational and normal is obviously getting you nowhere. There's nothing rational or normal about rape; end of story.
We have trapped emotions left over from the event/s. It's the screaming inside us that needs to get out. It doesn't matter why. It's an essential part of recovering. So please stop thinking and start expressing those feelings through your child's voice, not the adult in you who's trying to find reasons that don't exist.
It's primal and linked to being an amimal, not a social issue. Pent-up, unexpressed pain eats away at us. It can't dissapate or just go away. It has to be released through our voices. I screamed into a pillow in my car on many occasions. It bought me calm, at least in the beginning.
Rape is as close as it gets to dying. In fact, that's what it feels like. So why repress those fears and feelings? Accepting you were completely helpless in that moment is what can free you. Again, it's not about why it happened. In the eyes of your abusers, blaming you gets them off the hook. That's a Universal Truth!
So please Evie, learn to 'name' your feelings. If it feels like a rock in the pit of your guts, then say that. If it's pain in your chest then identify that. It doesn't matter why, for now.
You take care and be gentle with yourself ok.
xo 