Cousin hit me first, now sisters arent on my side?

went to Romania to see my family with my 2?sisters . We have a cousin here. there is no AC and its really hot and we have a fan in the room. So im like turn on the fan please its really hot. Then she just randomly yells at me (they all yell here on my moms side of the family they all have mental illnesses. Not saying this rudely they just genuinely do. One has schizophrenia the other is too controlling and my cousin is the daughter of the too controlling one) anyways she yells shes like im cold. Im like ok whatever ill just move it towards me. Then she gets up and is just yelling at me like no i dont want to get up no dont move it dont turn it on. Im like how selfish can you be im dying here its hot! You dont even have to feel it!!! And shes threatening to hit me . Im 18 and shes like 30. Then she actually has the audacity to hit me!!! So i started shoving her against the furniture and beating her ten times worse until my sister in the room with us grabs me and takes me off her. Then i start yelling at all of them for being so irrational and how dare she put her hands on me and they are all sick in the head. Then naomi kicks me out the room. Like how dare she?! Hit me for something so small?! What grown adult does that?! Id never ever hit first no matter what. I just had to put her in her place afterwards to show her not to mess with me like that ever again. The next morning my sisters are STILL like telling me how wrong i am for hurting her even tho she HIT me first!