Oh, i did the same thing in primary school at maybe 6 or 7.
The other kids were pressuring me to kiss this boy i had a huge crush on, as a way to humiliate him i guess (just because kissing was embarrassing for boys at that age, i guess.) They actually cornered him and made sure he didn’t get away. I saw it as a win win because i was into him and I wanted the other kids to like me. So i kissed him and i think he cried and later he asked me why i had done it.
i wish i had realized that was an awful thing to do.
We did become friends again after that though and went on a sort of movie date when i was 11 or 12 but didn’t kiss at all that time.