Having walked away from a roll over in my teens, I completely understand the terror felt of getting behind the wheel.
My first piece of advice is don't rush it. Give your brain time to emotionally recover.
Then begin with short trips. Drive to a neighbor's house that's within walking distance.
And finally, when you feel ready, drive that road again with dad riding shot gun.
Sorry you had to learn the hard lesson. My rollover was my first introduction to black ice. 30 years later and the stuff still scares me.
Sent from my DROID RAZR using Bimmer App