I did something truly horrible and I can't forgive myself at all after all these years

I saw this post about this user talking about how they were exposed to porn as a child and did something to their friend or something. I had the same shit as a child and I will NEVER forgive myself. I did the same thing but to my younger brother and so on. I was around 6 or 7. Later on my brother asked for this a few more times and then we never did it again. I really fucking hope he forgot this because it still haunts me to this day and I truly care about him. I have truly failed as a older sister and fear he sees me in a different light because of that. What if he actually thinks of me in that light just because I was a stupid child then and didn't know what I was doing. I have done one other thing to another kid (not that bad but still) and I feel like they haven't forgot about this after all these years and that was why our connection was cut .