Was I Assaulted?

Yesterday there was an article on the BBC News website about peer rape in primary school that unearthed a repressed memory I've not been able to get out of my head. When I was 7-8 ish I lived next to a girl who was i think about 10 or 11 (at the time of the incident) who used to come round to play. The thing I'm wondering about happened on 2 occasions (that I can remember). One time, when it was just me and her in my room, she lay down on my bed and got me to go on top of her and start grinding. The other time she got me to do the same thing, but that time there were 4 of us and she got us to continuously switch places with eachother. As well as that there was one time where she shut my in my living room and made me watch the porn channel and another time where I had her and a male friend round and she made us kiss and tried to make us have sex but we went into the bathroom and pretended to instead. I feel horrible reading what I've written and I just want to forget it again but I need to know if i was sexually assaulted.

Update: I went along with it because I didn't know what I was doing. With the porn I think I said I didn't want to because I didn't want to get in trouble but she said her gran let's her watch it and kept it on