TW mention csa

At the moment in T we are looking at my brothers abusive behaviour just physical, but I want to know if his behaviours growing are typical of a sibling.
When I was about 7 or 8 and he was 11 or 12 he would often straddle me and tickle me and I remember one incident where he covered my mouth and said that if I told mum something bad would happen. Also all through my teen years he seemed interested in my menstrual cycle and on more than one occasion he stood at the door of my bedroom while i had sex with a boyfriend, I don't know how long he stood there for. Also when I first started using make up he said I looked like a w****.

I just get a feeling these are wrong as I feel panic and shake when i remember them.
Thanks for reading.