When people ask Why, what do you say?

I still am slowly coming out to people close to me and they always get hung up on Why I am non-binary. Saying I don't feel like a man or like a woman doesn't seem to answer their question.

What do you all say when people ask why? Or how do you redirect the question?

Edit: these comments are helpful for general people. I should have specified it for my loving mom and dad. They just don't understand and want to support me. I'm out to my mom but not dad. (26 Y/O)