Need clarification for what I did.... normal or not??

Hi
This is my 1st post and I’m really struggling with a memory that came back to me year ago.....
I remembered an incident that occurred between my brother and me. There are 18 months between us. At the age of 6,7or 8.... I can’t remember exactly, basically I naked dry humped him.
The memory is so vague, but I remember him saying “I don’t want to” and that was it I stopped. Never did it before or since it was quite literally 20-30 seconds of my life.
I hadn’t thought about it for decades. It popped into my head a year ago (I’m in my 30’s now).
I confronted my brother and told him I was sorry that I ever did that to him. He laughed and said it was a normal thing that a lot of kids/siblings experience. I’ve confessed to both my mum and my husband, they think I’m worrying unessecarily and have both divulges their own weird childhood experiences.
When I was a child a few things happened to me, I was touched inappropriately and treated sexually by my uncle from a young age, I don’t know whether this is why I did what I did. Also I had other friends from my age group act inappropriately with me and teach me things regarding sex. I don’t know whether this is why I did. In my head I feel like I am a terrible person who doesn’t deserve to be alive. But I don’t know whether I’m confusing what I feel about what my uncle (an adult) did and projecting those feelings on my child self.
Any input gratefully received... I am literally driving myself nuts!!
Thanks for reading

You totally do deserve to be alive and I feel anger at your uncle b/c I think his treatment of you has let to these feels of self-doubt and self-disgust. Your "victim" has assured you it was experimentation so please please try to take their word for it I absolutely agree with you that this is just mixed-up projection. Nothing you have said makes you sound like a bad person or abnormal.

abnormal.

I really don't think it makes sense to label someone as permanently abnormal for something they did as a 6/7/8-year-old child.

You probably did it because of things you were experiencing but even if not I dont think its abnormal.

I was abused and am pretty messed up because of it, but there was a much bigger age gap! But you know what? The worst part is that he’s never said anything. I don’t think what you did is a big deal because of how young you were, and the age gap being pretty small. But even if it had been an issue, you have done the biggest thing you could by bringing it out in the open with him and your mum!

Seriously, I can feel myself dying from all the damage the abuse and lack of remorse has caused me. If I don’t think you need to feel guilty I’m pretty sure you’re the only person who thinks you do. Please forgive yourself!