I'm going to cut my sister out of my life
Is your sister an evil person?
She's so annoying, always subverting me, getting down on me because she thinks I'm not good enough to her.
Then it is time to cut her out of your life. She sounds quite toxic and those types of people will always bring you down.
She needs to see how her behavior is wrong. I want terminate the relationship.
It sounds like a lot of unresolved resentments have festered between you over the years. Family counseling could benefit you both.