It seems you might be massively underleveled. I just finished Freeing the White Witch, and I'm level 11 or so. Not sure how you missed out on so many levels, did you only do the main quest?
Not really; in fact, my level was as high as it could have been at the time, and there was nowhere else to level, except finishing that quest :P
As for right now: I haven't even freed the witch yet and I'm almost level 13. So I agree that leveling versus content might be a bit off here and there.
Thanks for replying!