I almost killed someone?

alright,well it was a usual morning and my dad was as usal really annoying the helll out of me...and i thought of killing him and before i knew it i was headed towards him really quickley about to scratch him.everything went by in a haze,he turned around before i did anything.bu i feel soooo horrible i didn't mean to do that at all.i mean yes like everyone else i think about killing someone,but i would never let myself do it.....please help me,i feel disgusted with myself.....please.i'm only 13