Congrats! I've heard the same eye-opener story many times, and experienced it myself. Be prepared to be lambasted by know-it-alls who will expalin that it is a silly game with paper targets that don't shoot back and doesn't represent reality. They are right, but they fail to see that this enforces what you learned--if you can't handle the artificial stress encountered in a match, how would a real fight turn out? These know-it-alls are often folks who tried IDPA and finished last. Instead of swallowing their pride and improving their skill set and mental game, they live in denial and believe they are fully prepared for a gunfight because they have taken tactical pistol ninja level 2, etc. Some even claim that shooting IDPA matches will get you killed.
IDPA is only a game, but it's a great way to find out how you shoot under less than ideal conditions. Enjoy!