Congrats on saving a huge down payment for a car. That’s quite an achievement for a 17-year-old, so kudos!
If you’ve already saved up money, you might want to consider buying a used car or a less expensive new car for which you can pay cash. If you have your heart set on a particular model and you need a loan, you will have to wait until you’re 18. At 18, you can enter into a car loan, although you may need a cosigner due to your limited credit history.