This is how otherkin happens, though... you try it, and find out that it feels better. It feels like you. You get... species euphoria.

Does it matter if you are "a bit of a chameleon"? If you truly enjoy this, then would that even be any reason to stop?

I don't think you're overthinking it. These are all valid questions to have about your identity. I think finding answers will get you closer to what you feel is right.

Time to get on a little cart, we're going On A Rail
It's Black Mesa time with a keettee