So you start a worgen. The first six or so levels take place as a human, fighting against the worgen, before you are infected.
Worgen learn druidism from the night elves.
You meet the night elves after you become a worgen.
What does a player rolling a worgen druid do for the first six or so levels? Human casting wrath, with no way of having learned it? Or might you play those first few levels as another, generic class, and switch over to druid once you meet the nelfs.