I'm starting to resent my family for acting like i suck

I might sound like a brat, but i'm really tired of my family acting like i suck so much and everyone is better than me like comparing me to my 13 year old cousin who they think is smarter than me and nicer than
me and acting like i suck while saying that if i drop out of private school my siblings can "replace" me so they do not care. And lately my dad the guy who bought me a iphone 6 plus acted like i own him 1 billion dollars while my sister acts like a civilized smart person to win s favors from my mom and dad while my brother is acting like he is a hard working to win favours like my sis. And my grandma likes my sis and hates me and my grandpa always have a grandpa and grandson walk at the ocean thats near his house. I'm getting angrier now when my aunt calls from china to brag her about how my cousin got top marks and her message means i suck cause i got 30 percent a+ and 40 percent a and 25 percent a- and 5 percent b+ in private and then my family and a whole bunch of relatives sound like she is right.so i have to embrace myself to prepare the sound of my mom the women who used to buy everything iwant no matter what the price is to yell at me. I don't know how i can live with these people who are influenced by my aunts blabbering who make me sound horrible while i'm not bad but i don't know what to do Please Help ME.

Maybe you should talk to your parents about it and tell them how you feel