Dearest sibling

Is it normal to be in a normal, unaggrivated state, and then boom. Mood switches to the most psychotic shit ever, just because your sibling is present?

Ever just be sitting there, doing whatever dumb shit (or important) you do, and your sibling just walks by, and you lose all focus because you want to stab them? I don't want to kill my sibling because of any other reason than i'm bored of the same old lame person. They don't do anything. They just sit around and play video games and watch shit online and suck up our parents money. They directly and indirectly annoy the energy right out of me.

Am I okay? Is this okay?

PS, I'm sick and tired of League Of Legends being the background noise to my life.