I know exactly what you mean, and while I've started to get a little braver (with the low level duty roulette anyway), I still feel anxiety whenever I queue-up as a tank. I'm usually healer, so I'm outside my comfort zone as it is, then I have a random chance of either getting a decent party (luck has held lately with the roulette so far), or I'll get partied up with that one impatient DPS that runs ahead and aggros stuff to try and drag you forward because they aren't there to play with people, or to play through the dungeon content, they're there to make their numbers go up as fast as possible.

Or you get that snobby Whm that freaks out if a monster gets a couple hits in before you pull them back off... In Copperbell (normal mode)... Heck, you try to be nice to newbies in Sastasha and even then there's a chance you're paired with a new player who spits in your face at the 'dishonor' of even insinuating they need pointers.