What Makes You Believe /You/ Are Therian?

For me it's a general disconnect with humanity along with various types of shifts starting from a young age
I've always felt much calmer and more like myself around animals. It's true that a variety of animals don't get along (for example, I've always felt particularly comfortable around cats, when they'd have no problem hunting my theriotype(s)), but I feel like I'm on much more equal standing to them compared to humans. Not to mention a deep yearning for wings and the life of a bird as a whole for as long as I can remember
I've experienced phantom wings on and off for years, and for the same amount of time, have felt like a quadrupedal gait would suit me far better while I lack the light weight and hollow bones of a bird (which probably points to another theriotype I'm still not sure of)
At the core of it, it's a sense of just *knowing* there's some animal part of me

I believe I am a therian mainly because I feel such a strong sense of belonging with the experiences and people in the community. I feel I relate on such a deeply emotional and psychological level with everything I see people talk about here, all the talk of shifting and feeling othered and having an animal brain seems like exactly me any time I read about it.
Now, to get into the specifics, I have felt like an avian for the longest of times. I knew since I was young that I was meant to have wings and claws and fly freely. But I haven't had the language to express that intuition until the last couple of years.
And that's really all I know lol

I reckon I probably got weirdly attached to a particular animal during my horrendous teen years as some sort of comfort thing. Developed species dysphoria and then it stuck and irriversibly changed how I saw myself. That's my best guess.