Don't listen to these fools with their common sense and experience.
YOU are 17, and definitely have the world all figured out. I can tell you have though this plan through carefully, from all angles - you have nothing to worry about.
Follow your heart and get the car of your dreams, don't listen to banks with their wishy-washy "co-signer" crap, they are just playing hard ball. You need to make an appointment to see a financial adviser, then get in there and just lay it on the line - you say "I would like a $15,000 loan please sir, I have no security or credit history to speak of, but I do REALLY want this car" then he'll say some bullshit like "We can't give you a loan on that basis" and then what you do (this is the secret) you lean over the desk, grab him by the tie and say "I'm 17 mother****er! I know the game, you pick up your little pen there and you draw a game of hang-man on the table; if I win you give me that loan, if you win I'll give you THREE bits of driftwood and a pair of lesbian gerbils and you'll never hear from me again". Then sit back and watch him retreat like a smacked puppy.
Trust me :thumbsup: