In my opinion idea you are spiritually an animal is in my opinion no weirder than believing in gods and miracles. It is ultimately your decision. However my usual statments about religion apply, don't hurt yourself, and don't hurt others.
My own personal view, if you are interested, is that what your feeling is just a side effect of growing up, and your mind not being quite sure how to cope. I have never believed in the soul at all, and have always felt the simplest answer is usually the right one. Your body is confused due to the stress of being (If your profile is accurate) in your early teens, hence why your feeling something is "wrong".
May I request that people posting in this thread remain respectful of other's beliefs, however strange they may appear. You are allowed to disagree with something, but try to state your viewpoint without resorting to insults and swearing.