You need to move out first fella. Owning a brand new car but living with your parents? C'mon.
The trouble is that the Stang is going to tie you down for what, three years at least? And then you're going to have to refinance the balloon, or sell the car, so either that's another three years or you've just wasted three years. If you're spending that much on the car then you're definitely not going to be able to do any serious saving, which means that you're even further from moving out, and at 23/24 you're really going to want your own place. That's the point when you realise that you definitely can't afford anywhere as interest rates are higher and property has gone up another 20%, so you're even more stuffed.
If you had your own place already (owned or rented) then I'd say go for it and live the dream, but as you don't and you're on practically minimum wage then that's just crazy.