You'll be charged with underage drinking, if you blow a 0.09 and you're talking about juvie, so it looks like you're 18 or under which puts you under the legal drinking age.
Either way, consider investing in one of these and permanently lodging it in your asshole.
Isn't .08 the max? Or is it based on State. .08 being the NY requirement before DWI. .04 Before DUI. But I don't think you'll get in trouble as much as your friend. You could probably get out of all of it if you get a good lawyer and decide to be a dick and blame it all on your friend.
Have fun paying for the damage you did to the golf course. I work at a golf course and this kid drove on to the course and was doing donuts and got caught and he had to fork over $30,000 for the damages.