Good job. I hope you do well at nationals.
However you got 9th out of the 10 people. I don't want to be a downer but know that the national is of course going to be much more competitive, so haul ass and train like you've never trained before until it's time for the triathlon. Train until you have the skill and endurance to smoke whoever got 1st place in the race you got 9th in if you were to do that same race again.