Is it normal to want to kill someone for making you angry?
I've been having anger management issues lately. I don't know if it's because of stress due to school, or if due to something else like genes or something. But i know that i've certainly changed these last few months, i've become more easily irritable but always bottled up the anger which made me assume that it's what causes me to blow up lately. Earlier today, my sister and i had a stupid argument. She was calling to me for the kitchen to help her out with something, but i had my headphones on while i was playing video games. She came into my room, angrily snatched my headphones, and broke them in half. I followed her into the kitchen, we were both yelling at eachother, and when i felt like i had enough, i grabbed the knife that was sitting on the counter but slammed it down on the table roughly instead of doing what i originally had in mind. I pushed my sister roughly into a shelf, and stormed out of the kitchen. I do feel bad for what i've done, but i feel like she shouldn't have broken my headphones in the first place.
And that's not the only thing that happened this week. Two days ago, me and her had yet another stupid argument that i forgot what was about. Anyways, it led to me throwing a small fan at her, and a little glass trinket across the room. If my mom hadn't stopped me, i could have done worse.
I don't know if i want to see a therapist, and i don't know if i want to talk to someone about this. I just don't know what to do. I need advice. Is this normal?