I just threw a plate across the dinner table for something trivial my sister did. Now I feel like stabbing her. Is something wrong with me?

I am not usually like this. It has been years since I've exploded. My sister and I have a complicated relationship. I've always despised her when we were young. In school, she's the mean girl wanna-be-queen kind of teenager. She rubs her shit onto everyone she dislikes (both long-term and temporary).

I was especially triggered by how she looked at me with a condescending and challenging stare after I threw the plate. I swear that if there was no law criminalizing murder, I would've stabbed her with my fork right through her artery.

It takes a lot to get me to perform such horrendous act. Everyone knows that. This is not my normal self. This part of me just so suddenly surfaced without warning. Worse, due to a very, very trivial matter. Is there something wrong with me?