Don't worry about looking stupid. Looking stupid makes you appear to be a weak player, and assuming you're not a weak player, this is exactly what you want. If anything, go out of your way to look stupid!
Oh, and live tells
are overrated. Nobody is going to ba able to 'see into your soul' as long as you're reasonably aware of the signals you're giving out. Don't place too much credence in any 'tells' on others you pick up on either, unless they're very strong and repeated, just play your cards against your opponents ranges and playing tendencies as per usual.