As a tank, you're the one who sets the run speed in regular dungeons. Don't like to speedrun? Just pull small packs. DPS trying to pull more packs? Let them die, unless thet can actually manage to tank them.

Always say you're new to the content. That way no one can really blame you if you mess up and no one told you what to do.

I don't think there's a whole lot of actual speedrunning happening in low-level dungeons, so you could go on and give healing a try as well.