I did something similar (but not quite as bad) when I was much younger (and MUCH stupider). I took my mum's car out for a joyride when I was 14. Misjudged a braking turn in a 1974 Mustang II Ghia and bumped a log with the left front wheel. Knackered the suspension a little (required replacing the lower A-arm).
I was absolutely sure that my chances of being able to walk and the chances of being able to write without the use of my teeth were completely out the window as soon as my dad found out.
But alas, my father knew that if he raised a hand to me at that point, he would probably have gone to prison for murder, so he did something MUCH worse.
At the time he had a 1971 Datsun 1600 that he had done his usual touch to and it was quite the little screamer of a car. What could be considered a street legal version of a rally car at the time. It was intended to be given to me as my first car when I turned 16. He had just gotten to the point that he was getting a company car for his job, so didn't need the Datsun any more.
So, after telling me that the car was going to be mine, having me wash and wax it lovingly as if it already was mine, he let it sit on the driveway for several months to torture me, then he turned around and sold it to one of my friends who proceeded to wrap it around a tree a few weeks later. He knew that would happen and made sure I knew it.
He then asked me if I was EVER going to take a car without the owner's permission. My response? "Hell no. That hurt more than ANY beating EVER could have!!!" His response? "Good. Glad it did. Because the loss of faith in you hurt MUCH worse than the damage to the car did."
I learned my lesson. Hope the driver of that car does, too.