My brother beats me up?

Hello, so I have a question. I'll give a bit of backstory first. I'm 15, my younger brother is 13. Growing up, my brother and I would always physically fight. Although, the most we would do would be punching, etc. I would never leave marks. But the older he has become, the more violent he is. He is about two inches taller than me and way, way stronger than me. When I was younger, my parents would always say, "Just wait until he's older. He'll beat the shit out of you." I guess they were right haha. My brother can pin my hands down with one hand so I can't fight back and use the other to hit and punch me. One time, he even used something sharp and stabbed me multiple times. He often kicks and punches me, leaving bruises and marks all over me. I no longer fight back. I grew out of it. I guess I kind of asked for it though. I'm the one who taught it to him. So, for my question. Is there any way I can stop him from doing this? Anything I can do or say?
My brother beats me up?
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