“Legally, you can’t get any loan until you’re 18, even if your parents are cosigners. Furthermore, you won’t be able to start building your credit until then, either.
If you want to take a step toward adulthood, you might try to convince your parents to pay cash for a car. Then you can start paying them back every month with a small interest rate.
This will help you build good habits in the future and prepare you for loan payments as an adult. Good luck convincing your parents!”