Why am I always treated unfairly and none of my siblings are?

I do my chores, get good grades, and never get into trouble outside of my home. But it seems like every chance my parents get they will turn against me and scream and yell at me and make me feel bad.. Just because they can. My siblings are never treated unfairly, my dad favors my brothers and he legit would buy my brothers anything they asked for, but it's like he would let me just sit in the shadows and get absolutely nothing from him.. I don't even get birthday presents anymore and for my sixteenth birthday they are making me have my party on the same day as my two brothers.. A month after my birthday! Like why have a party when it is not even close to my birthday anymore?! I know you think I am spoiled but honestly I am not.. I mean they tell me oh if you break your phone then you will never get another one.. Yet my sister had an iPhone broke it so they got her a Samsung, a few days later she breaks that they fix hers and she breaks it not even a week later.. Then breaks it to now it won't turn on. And then they get her another iPhone.. Yet I have been stuck with the most crappiest phone ever and probably won't ever get a new one.. But anyways it's like I will get screamed at if there is one or two dishes in the sink yet there could be a whole pile of dirty laundry and nothing would be said to my sister.. I swea they think air am their slave and honestly I want to just kill myself so sick don't have to live this hell of a place that I should love to come home to..