Shouldn't matter, as long as you have comp and everythings set straight paperwork wise the car should be insured for this kind of thing. If you don't have comp... well it doesn't really matter how it happened, the car's gone.
Sure a car doesn't just jump into a pole from driving normally... but everyones showed off before and slipped, I know I have, fortunately there wasn't a pole in the way.
In stead of deciding if you're a good driver, a liar or not, I am so sorry that you have lost your S15. I f**king wept when my car was scratched on the front bumper in the drive way. I can't imagine how hard it would be and disappointed I would be in myself if I wrote my car off.
I hope everything works out!