I beat my sister, I regret it, how can she forgive me?

He disrespected me and wasn't doing the responsibilities he was supposed to do. I was doing it instead of him for about 2 years and I beat him last night. I was so angry that she scratched my hand with her nails. Because I'm always treated unfairly in this house and I exploded in the end, but I didn't want it to be like this.

Updates
7 mo
When I say her I mean my sister and then I talk about my family because my sister is 19 years old and younger than me so my family is not angry with her they are only angry with me I have to do the responsibilities that he has to do.
Updates
7 mo
I gave up on apologizing to my sister, she made me very upset.
I beat my sister, I regret it, how can she forgive me?
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