Depends on the context.
Dictionary definition:
Human:
a human being, especially a person as distinguished from an animal or (in science fiction) an alien.
So that’s a start.
But:
“What does considering myself “human”
accomplish with regards to my sense of
identity and purpose?”
That’s a deeper question indeed.
Or perhaps it’s not.
What it means to be human:
It gives me a sense of identity and purpose.
But… purpose? There’s the tougher part.