Vyo, Do not be disappointed with your performance. I have had the opportunity to visit the Olympic Training Center 3 times in two different sports and live there for a year with one of them. Those first few national events and invitations were, looking back on them, just more experience I needed to get where I needed to get to. Take every bit of that experience and use it for every other race you have. Think about the discussions you had with others and take from them what you can. Figure out ways you can fix when you think went wrong. Have a backup plan for your backup plan :p
This is but one step on your journey. Get ready for your next step!