Why is this happening?

Hey guys, i have a question. I never drunk a lot, only on some special occasions and that, and it was always funny and cool. Since last year, something changed and im not sure why, but the thing is i get INSANELY aggresive when im drunk. When im sober, im very shy and quiet person, i don’t argue with people, i keep everything to myself and inside myself, also i love to smoke weed and have fun.

but since last year, something changed. I always blackout, doesn’t matter how much i drink, it will end up in blackout and me not knowing what i did. Whenever i get drunk, i trash my apartment, fight with my gf, fight with random people, call my mom or dad on phone and tell them awful things, it’s like satan posses me idk.

Last thing that happened and made me feel realy bad was just few days ago. I was at home, and my gf was at work, i was bored so i decided to drink bear or two and make launch for me and my gf. I remember i drunk 1 beer, then second beer, then third and blackout. Gf came home, found me on bed sleeping with dishes broken all over house, and groceries for launch also trashed everywhere. When i woke up, i felt so bad, and decided i will never drink again until i figure out what is wrong with me. Does anyone know why this happens? I was never aggressive drunk, i could get wasted and still have fun and act normal, but somehting just changed since last year. Is this fixable? Will i ever be able to get drunk again normaly? 🙁