Just check my signature for the links you need to find your local SCCA region. From there it's just getting the gumption to head out to the next event. I would be shocked and amazed if your parents didn't know some of your local SCCA people as well, not to mention that there are tons of clubs oustide the SCCA that have events.
Just be prepared to become obsessed! Racing is about the most fun you can have with your pants on, and even though your not door to door with people, the competition can really get in your blood.
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...