It never truly felt real (COCSA)

I was five years old when it happened. My abuser was also a five year old girl. I remember thinking that my story isn't valid because she's exactly the same as me. Over time, I did research and started to realize and recollect more and more about the memories of my abuse. If you get triggered or have triggers related to sexual assault/abuse, I advise not reading this next part. At first, I forgot the entire event ever happened. I remember being about 11 when I realized what had happened. The memories started gradually coming back. She was my friend. We were normal five year olds, I'd always have playdates at her house. At every playdate, she'd take me to her playroom. She'd lock the door and draw the blinds. Then, she'd make me lie down on this small mattress on the floor. She called it a game. She said that she was the doctor and that I was the patient. Once I'm on the mattress, she'd get on top of me. She'd touch me under my clothes. She'd look under my clothes. She'd take off my clothes. I remember just hoping, wishing, and praying that it would soon be over. If you're wondering, I was wearing a school uniform most of the time whenever this happened. This went on for almost the entire year when I was five. When I remembered and realized what had happened to me, I didn't believe it. I thought I was overreacting. I thought I was making it up. How could someone the same age and gender as me sexually abuse me? I'd only seen cases of young girls getting abused by older men. So how could a young girl be assaulted by another young girl? A few years have passed since I first remembered the events. I've gotten wiser, and discovered that there are many forms of assault. When I first found out what COCSA was, I felt so accepted. It was so validating, knowing that these memories that have destroyed me for years and years... they're real, and they're valid.