Christianity teaches:

There are three persons — Father, Son, and Holy Spirit — each of whom is fully God, distinct from the others, but all share one divine essence.

And at the same time:

There is only one God, not three. An essence is what something is.
A hypostasis (or individual) is who or what instantiates that essence.

So:

You are a human because you
instantiate the essence of humanity.

I could also instantiate that essence — but we are not one human.