I think you made a great choice.
I got mine at age 14 (8th grade) from my dads friend, all original.
My dad and I re built the motor, and I helped the body man with the work and paint, make him do the work, and spend a little of his money so he can appreciate it.
I've never wrecked mine, never really came close, I have too much of my own $ and my parents $ and my dad & me into the car, I wouldn't even think of street racing it, or getting into a position to wreck the car.
I think the problem these days, is the parents buy an older car for their kids all fixed up for 13-18k, nothing special, but better than what mine was through, so they don't have much into it, and they wreck them at some point through high school.
It helps to know about mechanics and how to do things, but my friend got a 68 mustang in decent shape, was doing a one wheel peel to impress some friends, hit a curb and damaged the car... I thoroughly believe if he put his own time, money, and heart into the car, it wouldn't have happened.
My parents never tossed me the keys, I didn't start driving the car without my Dad until senior year, it was cool just being able to drive it with him, looking over my shoulder, so that probably rubbed off on me. Now that I've earned their respect, I can take it just about anywhere, any time I want, while they probably still worry some, they know I appreciate the car just as much as they do, if not more.