Ha, I would have been in that same race!! It would have been my sophmore year, running for the powerhouse James Buchanan XC team from Mercersburg, PA. Not sure how I did, but it was probably in the neighborhood of 17:30 or so. I believe a teammate of mine actually won that race, he was a junior.
It's funny, I recently ran a marathon at a faster average pace than I did for that 5k course.
As far as my first race ever, I don't really remember. It was probably on James Buchanan's home course (4 stream crossings, but since changed, which is a shame, as it was a great 2.8 mile course). No idea what I ran, the first time I remember a time was when I ran like 18:35 on Greencastle's course my freshman year.