WTB.... Human Druids?

Just Sorta thinking a bit and came across the though of... Why arent there any human druids?

For one thing Worgens are basically humans with a curse on them. Just Because there a werewolf now there able to be druids? Also They were "Druids" Before they even got bitten by the creepy dude in the cellar... So Why exactly arent humans capable of being druids. Just kinda curious about it. Not Complaining of anything... Just creatively thinking. Post you thoughts :).