Possible to play NL tourneys well but 100% SUCK at online cash games?

I'm new to poker. (No, I don't want to play with you.)

I've played in a couple of local tournaments (for charity), and feel I am headed in the right direction. No wins yet, but getting better, feeling more confident. Not making a complete ass of myself, at least.

Online, though, it's a different story. I have been playing at PP for about two months now, and I just seem to be horrible. I know there are conspiracy theorists who think the online games are rigged; call me naive, but I doubt this, at least in the case of PP.

I suppose it's possible that play differently online (more loose, I suppose), and I also know that people tend to get away with crazy things online what with all the checking and calling that goes on. However, it just seems to me that, while I stand a chance at playing well in live games, I may just never be good at online poker.

Any thoughts on this?