tired of being a pianist

so idk i just wanted to get this off my chest, i've been playing the piano for 10 years and basically my whole life (I AM NOT 10 YEARS OLD) and i feel like everyone in my family only sees me as "The Pianist™" and even tho my parents got me an electric guitar because i genuinely want to play it, they still told me that i can be both a pianist and a guitarist and it feels like i have no option but to keep playing piano. I'm not lazy, i just don't like it anymore. I hate it. I feel nothing but hate and frustration when i play, and when i enjoy it it's rarely, when i'm just doing my own thing and fooling around in it. But i'm in a music school, in piano classes. I can't just quit. It's a very strict school and the pressure of getting high grades and being a perfect student kills the passion i once had. I've cried in piano class more than once because of it. My teacher keeps telling me to "sit on the piano and play for 5 HOURS EVERYDAY!!!11" but i just can't bro, I CANT SIT ON THE PIANO FOR MORE THAN 90 MINS. I don't know what i can do to enjoy playing the piano like i did before. I feel like i'm chained to it. It's also slightly affected my personal view towards one of my friends, who is my piano partner in chamber music (4 hands pieces). She has less time playing the piano than me, and she gets better grades and she plays pieces that are "less professional" than the ones i do. My teacher sometimes compares me to her and it rips my soul to shreds. I know it's bad to feel envy and that's why i'm trying to ignore that and not let it affect my friendship with her.

TLDR: me veri sad bcuz piano :(