AIO I think my little brother SA'd me

So I (14F) have a little brother (10M) who has always been touchy. It got to a point when I didn't feel safe in a room with him.

One time when I was 10 and he was 7, I wore my dad's t-shirt to bed and when I stood up, my bother got behind me, put his hands up the sleeves, and squeezed my chest. Obviously I was freaked out and didn't talk to him for a few days but he never apologized. All he did was laugh. Another time, I was in his room while he was in the shower. I was waiting for my little sister who shares a room with him. I was falling asleep and didn't realize he came in. I heard him say "ohh yeah" and when I looked down, I noticed he had grabbed my foot and was using it to m@sturbate. I kicked him and left as quickly as I could but I still felt violated and cried for hours. Last week me, him, my older sister, and my mom were all in the living room just hanging out and he licked my foot. It was so nasty and I yelled at him for it, but him and my mom just laughed and said it wasn't a big deal.

My older sister, (17F) is the only person who tells him to stop and actually tries to get him away. I told my friend about it once, and not long after she brought it up and said, "That's why your brother 🍇ed you." I don't think it was 🍇, but I didn't speak to her until my other friend stepped in and sorted it out.

Am I overreacting? I don't want to be offensive to actually SA victims