I simply can't understand what I did to make my sister hate me so much. She complains of me being oblivious to her trying to get my attention and then gets angry, cuts me off, puts in her headphones and turns them up loud when I try to explain the most likely reasons that I didn't notice her. What?
We used to be friends, but for the last year or so she's been a complete jerk and now that I retaliate, my mom blames us both.
I just don't understand how this happened or why.

Like, what did I do?
