If you are playing a shape shifting druid your character can easily tank. Especially if you pick up a few levels in Barbarian. Rage stays active after shape shifting and a raging bear is one of the tankiest builds available.

Without knowing how far you are it's difficulty to say if any companion are still available. Except for Shadowheart and Asterion I found all other companions fairly easy to miss in a blind playthrough. So you might want to read up on who they are and where to find them.