Have the tank get Leadership and everyone will be tanky

And if they stand behind the tank, enemies that run past will give free AoO.

Also, if you are dying real fast in Act 2, it means you either need to buy/find new gears or go to another area for quests. Look at the level of you and whatever is in that zone (like animals and other npcs) so you can tell if you're in the right area or not.