As far as casual chess goes, I'm a fairly average player. Sometimes I win, sometimes I lose, but I'm generally able to avoid obvious blunders, think a move or a couple forward, etc.
However, since I've taken up chess, I've tried my skills in some local tournaments, and the scenario is always the same - I get put on a 10- or 15-minute clock, and either run out of time, panic, or blunder, and walk out with a straight row of zeroes. I even lose to my friends that I can easily beat when not on the clock.
So - should I look at blitz chess in a different light? Think differently? Or is it just "practice, practice, practice" and "don't be a slow thinker"?