I hate playing my musical instrument?

I have been playing for 7 years now. It started off because I was little and bored; just a hobby. My grandparents are huge clical music fans so they think what I am doing is just so good. However now I have ped grade 8 and doing my Amus. I really don't want to do it though. The past year or so I have been losing my motivation to do it. It has been getting worse and right now I really hate it. I am on a music scholarship at my school, and cant go if I don't have the discount so I am forced into the music programs. I am missing out on eating every day because I have music lessons at lunch, and I am getting behind on my homework because I have music after school. I am really pionate about some subjects at school and want to follow that career pathway, but I keep missing cles. I am nagged to do my practice all the time when every note I play makes me more miserable. ITs concert after concert, I feel like a performing slave. Everyone calls me the 'viola girl' and it is really bad for my self esteem because it makes me feel like I can't be good at the things I love. If I quit I will be letting so many people down because music has become my life and involved everyone in it. But I feel so trapped sometimes I want to kill myself. I tried talking to my grandparents about it but they just say that I will grow up with it and it will be there my whole life; one day I will enjoy it alot. That just made me so depressed. I really want to smash my instrument. I love my school and my friends. It suits my learning style, and Im not good with change so switching would be a bad idea. Music wont affect my career choices at all if I chose to do what I want to do. However everyone thinks I'm going to be the next Beethoven or something. I don't even like clical music! Just can't take it anymore, I have another concert on Tuesday, but if I practice again I think I will have a breakdown. Ive been so distressed about it. Someone help me I don't want to be doomed to it for the rest of my life. I'm scared my grandparents are going to punish me or put me off my pion. They are going to take my iPod soon because I listen to what they call 'rubbish music' and they think its a bad influence on me. I am not just good at music. I feel so angry and jealous when people get recognized around the school for the pursuits I would die to be renowned for; just because I'm restrained to being a music servant. Please! To sit and eat lunch, and do my homework, just like a normal kid would be such a blessing, I am sure I have the potential! Theres no escape. Someone help me.