Is it possible to have blocked out memories of child molestation?

I just experience so many symptoms of a victim of a molestation victim, I don't even want to list them. It's embarrassing. When I was little (8yo) there was an older teenager that encouraged me and another 8yo boy to play "sex" and get on top of each other. I didn't understand it at the time and neither did he. I don't know know if there was more or how badly this messed me up as an adult. I'm 17. I have never talked about this to anyone else ever and every time I think about it I start to cry. Could there have been more? Is what she did bad? 

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