We're human.
First and foremost, let's make that clear, shall we? We have human form. Our thoughts are formed in human language. We enjoy and suffer human delights and concerns. We move, talk, think, act in human ways. This is accepted, no? We all understand that we are, without a doubt, human.
Now, on to the more interesting question.
All otherkin will discuss the pros and cons of being what they are. An angel will talk about memories of Heaven. Dragons will remember flight and their chosen caves longingly. Vampires debate the morality of feeding. Otherkin discuss the daily details of their 'kin with enthusiasm, and lament with each other that we're locked into these human forms.
Where's the delight with being human?
Consider this-
We're all otherkin, but none of us are the same. The dragons, angels, demons, fae, vampires, elves and various others are all different. What, in fact, is the same about any of us?
We're human.
Yes, we're othersouled. We hold a belief- indeed, this is merely a belief, not a proven fact, as much metaphysical discussion tends to be- that we are incarnations (be we walk-ins, multiples, starseeds or various others) of non-human things. Yes, we believe we are something that is not used to dealing with daily human life, and we discuss this with fervor. However, the very fact that we need to discuss this, analyze it and seek confirmation from others demonstrates that we're human.
Do angels need to verify that they're angels? No. Does a dragon doubt that it is a dragon? No. Humans question themselves. Humans question everything, and they do so with a dedication that has lead to philosophy, art, written language, mathematics, science, technology, music... Humanity itself has used its' desire to know to create wonderous things.
Isn't that the joy of being human?
We get so caught up in longing for what we think we were, or what we think we had, that we completely ignore what is right in front of our noses. Hold up your hand. Spread the fingers and look at it. Did dragons have hands like these? Could they pick up a pen and write a poem? Could they use a paintbrush to create an image the world has never before seen? Could they lift a flute to lips and play beautiful music?
Go out into the sunlight. Feel the warmth of it on your skin. Can vampires do this? Can vampires enjoy a juicy peach?
Take a moment to sprawl on a carpet and stare at the ceiling. Did angels do this? Did they have a chance to just relax? To enjoy a cup of coffee without restriction? Did they have relationships which didn't involve overwhelming amounts of responsibility?
Now the arguments can be made that we don't know for sure what their lives were like. That's true- all we're going off of is mythology, feelings, memories and logical discussion. This is all theory, but the facts we have are those of our humanity. Our ability to form close connections, develop ideas, make choices and explore is one of our greatest strengths. We're human and that's a good thing.
We have physical bodies that can move, bend, stretch, run and fold. We have minds that can examine, explore, ponder, analyze and create. We have hearts that can hurt, heal, love and break. We have language that allows us to share our thoughts and discoveries. We have the desire to seek, to learn, to find and know that which we do not already. Humanity is capable of great horror, yes, but also capable of great wonder. Was it an angel that painted the Mona Lisa? Did a dragon compose Mozart's operas? A vampire, certainly, didn't write along with Walt Whitman.
We are human, and we forget that so easily in the wonder of discovering more of our otherkin souls. I hope everyone realizes that, despite our longing to be whatever our souls once were (or may have been,) we are still human, and without our human desires and wonder, without the human curiosity, we never would have discovered there was a chance of being 'other' at all.
Being human isn't a curse. It's all we can be sure of, and when you're questioning the very nature of your own soul, that is something to be glad of. Enjoy your humanity. Eat a piece of fruit, stand in the sunlight, breathe in deep and find someone to hug, because this is what makes being human superior, not inferior.