thats damn quick for someone that isn't training specifically for it. well done
I wrestled in highschool. We ran six days week. We were NOT training for running, but over 90% of our team could run two 7 & 1/2 minute miles with no problem. I could most certainly to a 13.5 min two mile run at my peak. I would be absolutely gassed after it, but I could do it. Many of us could. Cutting down a few seconds to get to your 'olympic qualifier' time wouldn't be a stretch. That said, even though we weren't training for running, ya certainly pick up little tricks here and there as you go.
As for the here and now, I can run a 7 minute mile right now with no questions asked...and honestly I could probably do two if someone really gave me the proper encouragement. That would be not even a minute slower than your time...which really isn't much of a feat.