Abuse.

When I was about 13-14 I kinda remembered a new memory from my childhood. It was that my brother use to touch me when we were little. What annoys me is that I don’t remember in detail but I know it’d only happen when my mum would go out. And I know my clothes would come off such as my pants and he’d be on top of me. But I don’t remember what exactly he’d do. Did he put his **** in me? Or did he just touch my private areas? I also don’t remember what exact age this happened at. But I know it obviously happened in my old house. So anywhere from the age of 5-8. My brother is just about 4 years older than me. Not only this but we use to go to my neighbours house a lot. They were three boys. Youngest was my age.middle one was one-two years older than me. And the oldest was my brother age or even a year older than him. They use to make me and the middle boy do stuff aswell and watch . From what I remember my bottom private part was definitely exposed and so was the boys. And they’d make us rub on each other or touch each other. All I want to know is what does this mean. Was it child abuse? Was it sexual abuse? Was it rape? What does it classify as. And why did I never tell an adult or say stop.