Just to let you know I have been abused not only by bullying by school mates, but also my brother abusing me in a sexual way when i was little(~11), I know what it feels like to be abused. Never told my parents cos its just too much for me to do mentally, even now. My brother I can deal with now and he was only something like 15 when he did it, he has changed a lot and I don't think he would hurt anyone else, if I did I would say. Now he does not have the upper hand with me, I won't let him. So yes I do know what it feels like to be hurt emotionally and also for trust to be broken.
Aside from this conversation, I'm very sorry to hear what happened to you. It's truly horrible and your brother should really be on the sex offenders register, in all honesty. I hope you can continue to work through it and find some peace and happiness.