I dont know what to do, my life is becoming more complicated than I thought anyone help? (Read Details Please)?

This will be sort of long but I hope i get help. I have a passion for music but i have no experience in making music myself but i have wanted to for some time now about 2 years and my parents do not agree with me. They believe that I am still acting like a small child and thinking like one too they dont believe that this is what I really want and with the little freedom that they provide me i cannot prove them wrong either. They do not allow me to leave the house alone at any time and if i want to go to my friends house it has to be on the weekend and they drive me there. I want to play the guitar, well learn first how to play it but there is no way that i can learn without the approval of my parents. If i ask for lessons they will get mad and say that there is no money but if i do not ask for the lessons then they will believe that I am not interested in them and it makes everything complicated. I do deserve these lessons I have gotten the best grades i can get and was inducted into the National Honor Society and that is an incredible event. I am not saying that my parents do not care about this, I am saying that this is the only thing they see in me is great grades and no what I want which is being able to make music and learn how to play the guitar or an instrument. I would love to ask the music teacher in my high school but I have tried and it seems he is never there when I am trying to find him and the day ends up becoming meaningless. I need advice on what to do and good advice because talking with my parents about what I want wont work because I have tried it before and it led to arguing which is what i really want to avoid. I really want to make music and it is the only thing that pops in my mind even if i try to avoid thinking about it, it will somehow go back in my mind and will not go away. I am desperate for help and really want this i want this opportunity to play music or learn how to play an instrument. Just imaging me playing the electric guitar gets me excited and it is one of my dreams to make music. Please someone help and thank you for your time. My name is Luis and I attend James J. Ferris High School in New Jersey