I'm pissed at my sister for being nosy
Do you ever talk to her about your feelings?
No, I don't talk to her. She always makes a big deal out of nothing when I try.
It sounds like you're holding on to a lot of resentment and that your relationship with your sister is toxic. You should probably talk to someone about your issues with your sister and maybe about your parents.
No, I'm just going to send a mean text to my sister.
Your concerns about her nosiness are valid, but you should address it in a productive way instead of approaching it in an immature way.