There are more than a few fully sponsored pros that made their way up through the SCCA. From AutoX to amatuer road-racing, and then on to pro racing. MANY get their start in Karting.
Road racing does cost a bundle, but AutoX doesn't and it's a fanatastic proving ground and friendly place to grow your skills. And trust me, it can be as competitve as you want it to be.
Don't waste another minute waiting on parts, or anything else. Just get out there and start racing! You will suck at first, and you will be slower than many other cars, but the only thing you will regret is not starting earlier...