Okay so after some contemplating on this recurring issue about wharewolves and mermaids etc... my conclosion is the following.
Before choosing to be born into this time space reality you have chosen to be human therefore you were aware that there are certain laws that govern this earth plane that can't be changed such as the law of gravity and the law that you are human and you will remain human and no spell or ritual can ever change that. Magic can't change these basic universal laws.
That being said I think it's very possible for you to be a wharewolf in your dreams...study lucid dreaming or maybe although I'm not sure and I'm not advanced enough to guarantee but I think you can even do this through astral projection.
Bottomline is you can't be anything other than human in this waking life but in your imagination, dreams, astral projection etc you can be whatever you want.