Try pumping up your skilll in Light Armor, preferrably to the max.
The werewolf is "technically" wearing light armor.

If you have dawnguard installed werewolves automatically have an armor rating based on your level. Werewolves having benefits from the light armor skill tree no longer applies.

I'm Lvl. 81 and have no problem with anything I usually wait till like 40+ to start a Werewolf.

Yeah right werewolves easy to kill? pffff have you tried to kill Bob Marley know that is easy to kill

Ah, the age old quest! Why are werewolves even there? Hmm, I'd have to say (deep breath):

• To rip out man/mer/animal hearts to feed our insatiable urge to kill.
  
• To be the unparalleled apex predators Lord Hircine wants us to be.
  
• To cut a bloody swath across all of Tamriel and instill fear in our prey.
  
• Because we are just that awesome.

Mages do fine as Werewolves. There are no longer any perk / skill related boosts / detriments to lycanthropy. Sure, your "basic" defense is a health pool, and most mages don't tend to boost theirs very high, but as a mage you be used to the hit-and-run style of gameplay anyway. If anything, I prefer Lycanthropy on my mages - vampirism is just sort of a bonus set of spells when you're a wizard.

That would make the game too easy, because not many enemies have silver weapons, and you can stay a werewolf for a while.

Also, you don't die that fast, I can kill quite a lot of enemies in werewolf form. I find there is a lot of exaggeration in this thread.