Honestly, that car is ugly.
You don't really make $7-8 an hour; you pay taxes. Also don't rely on bullstuff figure for your tips. Finally, at that pay rate it will take 3 years to get $30,000, not 3/5 of a year. Being young with an expensive dangerous car you can expect to pay more than that $2000 a month insurance figure. How do you expect to pay for the insurance anyway? What about car fuel and maintenance?
It's an unreasonable goal.