Trans specied?

I feel lucky to have been born where i was but i don't think it was anything other than a happy accident. I was not more deserving than someone who was born in a place of war or poverty. I was just lucky. Similarly I was lucky to have been born human. I suppose dolphins feel lucky they are dolphins. Likewise dogs, cats etc. Maybe not cows. At least not american ones.
Some people feel they have been born into the wrong gendered body and i for one believe this to be possible. It seems odd to me that with the plethora of variations available to the human form that there would only be two genders. It seems likelier that there are some people with vaginas who feel they ought to have penises and so forth with all the transmutations of this idea. But what about different species? Could it be that you've been born into a human body but feel you have the soul of a cat? Why not? Maybe certain mental illnesses are really transpeciation- people who bray at the moon are not crazy after all, they are just wolves trapped in human bodies.
Just you wait a couple hundred years, science will back me up.