How do I stop being abusive to my younger siblings?

I am the eldest child of 6, so I have 5 younger siblings. I am 14.
My dad was abusive to me as a child, he hit me even when I didn't do anything wrong. For example he would whip me with a rope that had metal chains on it (30-40 times if I ever did anything wrong) He would drag me by my hair, he would burn my fingers with fire, he wouldn't let me eat for days, he would beat me up and kick me in my back and my stomach while I was laying on the ground and so on. When this all happend I was the ages 1-19 until my mom sued my dad and he went to jail.
My mom found a new guy, so I have 2 younger half siblings. The rest are my fully biological siblings.
I love my siblings a lot, all of them. And my dark past isn't an excuse to be abusive.
When I was younger I always told myself that I would neve turn out like my dad, but now I'm realizing that I'm just like him.
My 5 year old sister was having a horrible attitude towards my mother, so I told her to respect her. My sister looked at me like I did something wrong, so I got triggered and pushed her. She got mad so she hit me as hard as she could, so I dragged her down to the floor my her hair and kicked her.
Let me remind you, she is 5.
I'm such a terrible older sister, I'm just like my dad. Please help, I don't want to cause my little sister a bunch mental problems.
Updates
+1 y
Sorry I meant ages 1-9 not 1-19*
How do I stop being abusive to my younger siblings?
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