First of all, it sounds to me that the tournament was not held smoothly. I personnally would not have gone with a round-robin style with that many people. Instead, I would say a single-elimination style would have been better. However, that is just my opinion. As for your performance, do not sweat it. Just keep practicing, and you will be ready for the next tournament. Also, as stated earlier in the thread, the best way to get that practice is to get online with other SRK members. There is a lot of really good people here that play, and they will toughen you up mentally.