Well, you are by definition a loser if you bust the tournament on the bubble, whether you feel like one or not. I'm just being a bit facetious, as I imagine you meant something more figurative. Nonetheless, busting on the bubble is never fun, but it doesn't make you a "loser."
Fundiver and Perry both make good points--the bubble is essentially a line drawn in the sand arbitrarily in terms of how it relates to your play style. If you have been playing well, get a premium hand that you can't really fold even on the bubble, and you get coolered, it's simply bad timing and certainly doesn't make you a "loser." As to what Perry said, that often applies to me when I bust on the bubble. If I find myself with a short stack (e.g., 10 BB) and a premium hand (AKo+, AQs+), I'm happy to get it all in on the bubble and to be called because I am shooting for final tables more often than simply getting in the money. Because most of the money gets paid to the final table, it rarely makes sense to me to play just to get in the money.