Wow. I played in the 1999 RHS battle of the bands.
It was held in the school cafeteria. We ended up in 2nd place losing by 1 point to the 1st place band.
As said, your playing was solid, and it took me years to build the confidence to be able to move around and try to get more crowd interaction.
Since you are a white male, dont worry, once you start drinkin beer, rhythm will come naturally and you will start moving around.