I think I hate my sister.
Why do you hate your sister?
I just hate her with every single cell in my body.
Siblings are destined to have some conflict sometimes, but that is no reason to hate her forever. You should talk to your sister to try to understand your disagreements and come to a peaceful resolution.
There is no reason for it. I hate her because she is there.
I don't think that is a very valid reason to hate her. Maybe you should sit down and reflect on why she makes you so mad.