No need to be so hard on yourself

. Just learn from it, and make sure to not make the same mistake twice.
The roads are not your playground, whether empty or full of vehicles. You now realize this; good thing.
You also realize where your driving limit currently lies; this is a good thing. Work on improving that, as you said you will.
I suggest now that you have a general taste of how much fun that can be, find some nice spots where you can go and screw around on as recklessly as you'd like and not have to worry. A couple of the track near my house just unlock the gate in winter with a GIANT sign stating you are responsible for your own actions. I enjoy from time to time taking a vehicle and just putting it entirely out of control. Couple of buddies and I have junker cars we take out and just beat the ever living heck out of on that track on a yearly basis. Nothing like approacing a J corner at 70 MPH on snow and ice, on street radial tires (sometimes winter tires, always non-stud types though). Talk about an amazing feeling to nail that corner, and a scary one to figure out that you're not going to make it, and that damn fence sure is getting close, FAST.