This is the important bit. You learned your lesson. None of us are immune from stupidity. I'm sure that you will find the track days MUCH more fulfilling than driving too fast in canyons.
The point I think Pop is trying too hard to make is that the accident wouldn't have happened had you not been in a group that was driving too fast on an unfamiliar canyon road.
I'm not Mr. Safety who drives 5 under, but I have come to realize that when you get a group of people driving fast, and especially if that group contains even ONE competitive person, it's a recipe for trouble. Speeding is one thing, but when you're trying to keep up with the guy in front of you, that's when the **** really hits the fan. Not saying that's what happened to you. I'm saying that's what I've experienced.