Is it normal that i get angry at my sibling for no reason?

I currently have a sibling 10 years of age, and every time I see her, I get angry at her for everything she does. The way she walks makes me want to trip her and beat her head in before she can get up. The way she talks makes me want to punch her in the mouth so she can't speak. The things she eats makes me want to call her fat. And whenever she's away, I cherish every. Single. Moment. Whenever she first enters the house after being away, I say sarcastically, "Yay, the brat's here. So excited." I sometimes get daydreams of injuring her horridly and hospitalizing her.

Is this normal that I want to cause this much torment and pain towards my own sibling?