Some things happen to some people and some things don't. It happened to you, maybe it's not a matter of "normal" but more a matter of this IS what happened to you at those ages. It's your experience, it doesn't have to be a "normal". I would call it out of the norm for most children. So that would put you in a smaller percentage group of people who had those experiences. But it's still your reality and it does feel weird.

I am one of those people in the smaller percentage group that had something sexual happen to them at a similar age as you that most kids probably don't experience. I was ashamed afterwards that I was involved but the truth is I was coerced by another child. A child, not an adult in this case. A child is not an adult even if they acted upon another child. They are just as incapable of making adult decisions as you were. Innocent? Perhaps not but probably not abnormal. It just was what happened.

For me, it took years to turn my thinking around on this. I thought I was the scum of the earth but that wasn't the truth. The truth was I was still a child and I wasn't always well supervised. Another child had a curiosity and used me during an opportune moment to explore. I've learned to keep it that simple because it was just that simple. Granted, it made a mess of me but it can be worked through. Be easy on your child self, they didn't know everything you now know. Have hope!