If you're not into PDA, why start on your wedding day, sez I! You should only do what you feel comfortable doing, even if it isn't what people expect.
Are you worried about the tacky glass-clinking thing where you have to kiss when people start tapping their glasses? Cuz if you're uncomfortable with that, just lay down the law the first time it happens - I've heard of couples turning it around and announcing that guests have to donate a dollar for every glass-clink, or that they'll draw names out of a hat each time it happens and make THAT couple kiss!