Sorry to hear that Jane, you must have been pretty embarassed. Next time make sure you do a tech inspection first with an instructor at the track and have him look at everything on your car. They will point out things that you haven't thought of, even things like seating position, mirrors, etc.

How high was your tire pressure anyways?

Also remember to warm up those DOT-R's before you start to get really crazy on the track. Once you get your tire pressure down, people often say "one lap" is all it takes, but without a pyrometer, they are just guessing.