It's not that, I just prefer to shoot by myself. I go so rarely that I don't want to be constricted by rules and waiting, just want to do my thing. I'm not really into group activities of any kind, and really don't care for competition. Loner by nature, I reckon. I might go to a meet to watch sometime, but that's likely all I'd do is just watch.
For what it's worth, you only feel pressure at the local IDPA matches if you want to feel it. ONE time I saw an a-hole.