LJM...no worries, just keep in mind if you had been doing the same thing going down hill, it could have been worse because you actually have to use combination of brakes, clutch and throttle control and be in the right gear in order to smoothly deaccellerate...chopping the throttle, dropping the clutch lever while in the wrong gear makes running over the self imposed safety margin even easier.
Going up hill on deserted roads but crossing the double yellow is one thing, but doing the same downhill is a disaster waiting to happen. Don't get me wrong, all who have posted here have been there, and all at one time or another were caught in the moment...just don't do it once you know it happened, learning from it. Don't beat yourself up. This is a skill achieved by experience every time we suit up...now go out and enjoy the ride using the 7/10ths rule...it works.