Don't listen to the people telling you to buy used. You only buy used if its your only option and you only have a little cash with no stable income.
You have 15k saved up, more than enough for a solid down payment on a new car. As long as you have a job and can afford payments, you should definitely buy a new car. For your money, you will buy yourself a car with 0 miles, a warranty and a virtual guarantee of not having to worry about car-related stuff for at least 3-5 years. That is extremely valuable. Unless you like going to the repair shop and buying car parts, I suppose.
It really just depends on what you need it for. Just commuting to school and work? Get something smaller and fuel efficient. Lot's of small crossovers and hatchbacks out there.
Seriously, don't let the supposed "depreciation" deter you. People who say that are not factoring in the value of getting a car with zero miles and a warranty. As someone who bought multiple used cars over the years, because I only ever wanted to spend "$5000", guess what, I did that about 4-5 times before I finally decided, wtf am I doing? Why didn't I just buy one nice car to start with and just keep it till it dies?