use of past tenses

When we were children, my brother and I had our own game. We used to write on the fridge door. When I was playing or working on my homework, my brother was writing a short sentence in the kitchen and after that, he came back in his own bedroom. Then I went in for my turn in the kitchen. I liked writing another thing to contradict him. It was a nice war, a written debate... We always wanted to have the last word and use original and humorous words. I've always appreciated our discussions even though I didn't always understand his mathematical language. I've never been able to beat him in chess but I could score points in our literary games. It is also thanks to him that I was able to read a lot and discovered certain authors like Jules Vernes, Alexandre Dumas, or Victor Hugo… Every year, on Easter, we were competing to eat the most chocolate. I remember once, I had eaten all his whole box of chocolates. I had been eating for 10 minutes when he arrived in the room but I had finished all. He was very angry and, after that, I was sick. I shouldn't have eaten the chocolates. Now, as I've eaten so much chocolate when I was younger, I can't eat many chocolates without becoming disgusted. I can't bear a lot of the milk chocolate but I prefer the black chocolate. Anyway, it has more character.

***Overall very good! I could understand everything just fine. I just made some corrections to make it sound more natural! Even people who speak English natively make some of these grammar mistakes.