Is AUTHOR wrong in the post ? POST : My little sister (11y/o) is annoying. She always interrupts people in all kinds of converstations, only to give her irrelevant opinion on the topic. Not only that but she talks so much that sometimes i am getting headaches just from listening to her voice for hours everyday. I hate eating dinner with my family or watching a movie when she's also there. The things she talks about are also really stupid and i couldn't give less f*cks about the drama going on in her class or what her favourite k-pop singer did yesterday morning. I tried to explain to her why it's rude to talk over everyone and force her stories upon people but she doesn't care. In case no one is paying attention to her, she repeats the story a couple of times until she makes sure everyone has heard it.   When i tell her to shut up because she's being annoying and obnoxious she doesn't care and just continues talking and talking and talking. My parents tell me that I am being a jerk for telling her to shut up and for saying that literally no one f*cking cares. According to them i only say it because i have something against her and that i want her to feel bad about herself. 

Am i the asshole for telling her that i'd like some silence and that she should just keep her mouth shut for once? 
I am M/19 if that makes some sort of difference.