Awake, you made perfect sense.
I will clarify. To believe that you are "otherkin" aka have the soul of something more than human, you must believe in reincarnation. The belief is centered around the souls of angels, demons, and other beings incarnating (entering a physical life/body).
I also agree with Awake that people look too much for ways to feel "special" or "different" and gravitate toward trying to compare themselves with the traits of certain beings. This is backwards. You should be looking within to discover who you are.
those who learn to tap into their higher self, remember past lives, and basically have opened themselves up enough to be reacquainted with their soul's existence...they may discover that they are not exactly the same as what we consider human.
But many jump quickly to a stereotype like "vampire", "angel", "demon" etc, when in reality souls aren't "human"! Human is a name we created for our species on Earth, it is only our bodies. So this really is quite humorous when people say "my soul isn't human" with a serious stare. Of course not! But it doesn't mean you're "special" or a "freak".
Proof positive of whether or not someone is being honest or is looking for attention, ask yourself "Does what they say sound similar to a stereotype". The spiritual world doesn't have the same black and white views as we do. Take a look at nature itself. There is no holy and evil. But there most certainly is creation, preservation, and destruction. There is most certainly life and death. The physical natural world around us reflects the true character of the spiritual world. Mankind on earth has overcomplicated the world through their elaborate imaginations and their attempts to control one another.