With both Lycanthropy and Druid, you are warned that it is a permanent, irrevocable decision to take the skill. It cannot possibly be made any clearer (especially with Druid, there were like, 4 prompts before it let me take it.) So unless you're one of those "Blah blah yea go kill stuff" type of questers, and don't bother to read everything, you saw the warnings. You have no one to blame but yourself for taking on a permanent choice.