I need help.

I've wrote on here before but here goes nothing again. I feel so torn apart I was raped for 3 years from ages 8 to 10 by my half brother I'm now 17. I told my parents back when I was I think 15 or 13 and now I've been stuck in a 3 year court case and it's killing me at the thought this has weighed my life down for 6 years now and for all I know it could go all the way till next yr or the year after that my grandma is paying for his lawyer which disgusts me because that same barstard molested my sister when she was 5 years old she is now 9 and is also involved in the court case and for years I haven't been able to let go of the guilt of how I could let him do that to her. How come I didn't come forward sooner and stopped him before he turned on her aswel thinking about it just makes me sick to my stomach I've been told hes either going to jail or a mental institution but I feel now like I've ruined my sisters and now his life too I have to post anonymously because of the court case