Word for “by no choice of your own” such as your skin colour

At least three terms come to mind: my skin colour is natural, my nature is innate, my appearance is inborn.

As an atheist, I hesitate to suggest that the English language adjective for this is

God-given

e.g. She has a God-given talent…

meaning she was born with it.

(This does have an alternative use that does not fit this case, but should be obvious from the context.)

Of course the most obvious biblical expression is about leopards and spots, but it my be politic to leave the Ethiopians out of this.

"Inherent" works as a qualifier for that kind of thing.

Inherent (adj): existing as a natural or basic part of something.

Example: There are dangers/risks inherent in almost every sport.
[Cambridge English Dictionary]