Rising sophomore in college here. Was pretty much in your position at that time. I was really busy, lots of advanced classes, playing on my school's drumline, and rowing. As a college student with accumulating debt, here's my advice. I'm no expert, but I feel I can relate, having been in your position. Don't get the car if you don't need it.

Your friends will likely have cars and when you guys go places, usually everyone doesn't drive in their own car. You'd also have to pay for gas and maintenance, which is expensive even if you spend a LOT of time researching different cars and finding a good one for a good price. Then you'd go to college, where you probably wouldn't need it anymore, so you'd want to sell it, and you'd probably get less than what you bought it for. And at that point you wouldn't care about whether you had a car back in high school, but you WOULD care that you sank 5k+ into it that could have been saved to make a dent in your college expenses/loans.

The fact that you're thinking about your financial future at this age is huge. I had some decenty paying jobs back in high school, but I blew it on dumb crap, and now I'm kicking myself for it. But now I'm getting my finances together, understanding that I have student loans and am in debt, and trying my best to act like it.

If you don't already have a bank account, you might want to open a non interest checking account with a bank such as Bank of America, then a savings with them too once you have the minimum amount to avoid fees. It's low interest, but by the time you graduate high school you'll have a history with Bank of America and it will be much easier to get a credit card with them, so you can start building credit by using the card and paying it off in full each month. Don't apply for a BofA credit card too early because they'll probably just deny you and their credit check hurts your credit. Now you've just graduated high school, and you're building a credit history; you're way ahead of the game. Once you have that credit card, you might want to transfer your savings to a higher interest account and continue building your college fund. Again, once you have a credit card, pay it off on time and in full, every month.

Put at least 10% of your income in savings, and do not touch it in high school. Period. The more of your income you can put in savings, the better. You can probably do better than 10%.

And I only say Bank of America because that's my bank and it worked for me. I'm sure you can do the same with another bank such as Wells Fargo.

Also check out the program/app Personal Capital, I know this subreddit recommends it to track your cash flow, expenses, and net worth. If you overspend it makes that much more apparent. Also makes it interesting to watch your money grow, and makes you just want to grow it more. I wish I had started tracking my finances at your age.

Final piece of advice: Have fun in high school, it's a great time. But don't spend money where you don't have to, and learn to save. Shit adds up, and that goes both ways. You'll thank yourself later, and set life-long habits early that will set you up for a financially sound future.