Not to mention getting super-cool opportunities like being a Corner-worker at road races, which can eventually turn into being a safety worker at major professional races. We had at least one guy at the US Grand Prix a couple years ago, and every race you see on TV probably has SCCA members on every corner, just feet from the action.
I remember being right at the downshift point after a long straight, and had the shockwave from a 10,000 RPM full-race RX-7 punch me in the chest as it downshifted for the corner 5 feet from me.
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...