What do you think your alterhumanity is caused by?

Do you think your alterhumanity / therianthrophy is caused by something specific or see it simply as your personal identity?
Something I recently read online made me wonder how excatly do all of us experience it. Do you have a reason that you think explains it or not?

Im mainly a psychological Therian, and I believe my therianthropy is caused mostly by imprinting, and perhaps a little by neurodivergence, though I am not formally diagnosed with anything.

I grew up surrounded by cats in my household, and family and friends with dogs. I think this is where I “inherited” those behaviors from.
My paleotype and one of my fictotypes came from video games I played a lot as a child.
For my other ‘types, I can’t really say. For one of my fictotypes particularly, I cannot tell whether it is spiritual or psychological. I like referring to my life as my fictotype as a past life, like I lived as her, but I’m not really sure if that’s what I believe, or if it just feels easier language wise.

But anyways, I’d say growing up with animals was the biggest factor.