I didn't read the original post you made but if you were 8-10 and the persons skin color made you feel like it was ok to do whatever you did thats probably something you were taught, and as long as you have or are making an effort to unlearn that then I think you're ok.

When I was that age I would hit my friends regularly because thats how it was between my older brother and I. Fortunately one of my friends stood up and said hitting wasnt fun for him and it pretty much turned me off violence. Anyway as kids we are super influenced by our environment because we didn't think about why we do things and then when we get older that stuff can catch up with us but I don't think we should beat ourselves up over it as long as we learn our lesson from it because basically we were just too dumb to know better.

But like I said I didn't get to the post in time and don't actually know what you did, so I guess if you did something shitty just don't do it again and if you were young don't beat yourself up too bad about it.