I don't want anything to do with my sister
Why don't you want anything to do with your sister?
She is a good person, but I find her tiring.
Siblings can be tiresome sometimes, but if your sister is a good person then it's wrong to cut contact with her. We can choose to end relationships with siblings if we feel like they're not healthy, but arbitrarily ending one just because you find a sibling to be annoying isn't a good idea. You're likely to end up regretting cutting contact.
I'll regret nothing. She's a cunt and I'm hurting nobody.
You know better than to walk away from your sister over a trivial matter such as your own impatient with her. This is inconsiderate to just leave her, so rethink what is important and you will see that family trumps our own personal attitudes towards them.