Do you think I have a right to be annoyed at my sister for using me as an excuse?
How is she using you as an excuse?
She always makes it look like she is taking care of me.
It is ok to be annoyed at her for lying. She should tell people the truth so they can judge for themselves.
Yeah, I'm going to tell her to stop lying about me.
I think that's a good idea, because your sister really shouldn't be lying about you to other people. Her lies could give people the wrong impression of you.