Is it normal to do this?

One time me and my Dad were having an argument, and he said " this argument is over, you cannot win it", and i said "we'll see who wins when i'm old enough to murder!". i literally said it. i started to laugh, and it was uncontrollable. every time i have an argument or i dont understand something i just get so frustrated, i cant breathe when it happens. When i get frustrated or angry at someone i want to stab them. not shoot, not torture, (well i kinda want to torture them but still), i just wanna stab them. over and over. and also when i wanna stab them i feel wierd. kinda like i wanna laugh but i feel a little sad. today i made a new enemy and i just wanted to kick him to death or stab him until he dies. i dont understand it. im a christian and i would never murder anybody and i feel like i have a mental problem. i know i have agitation problems but i feel like i have something else too. its making me frustrated.