My parents wont let me learn how to drive?

this is really pissing me off. im a good student, i get As and Bs and i dont stay out late with friends or anything. They tell me im too messy and disorganized to drive, but then i point out my grades and they won't listen. I actually NEED to drive because my mom wont drive me to my sports because she's too tired, we have 2 cars and she only uses one of them...im pretty mad because i wanted to go to the gym, but my mom isn't able to drive me at all. Hello, we have another car just sitting in the garage! i'll admit that im messy, but how does that make me unable to drive? my grades are perfectly fine! they also say i can't concentrate-okay then, why am i not failing my classes if im not 'concentrating' ?! im so pissed off:( they wont listen to my arguments at all