Gender, enbyness
It's totally valid to be Enby just based on "I'm a Guy, but only on Paper"
It's Valid to be Enby because you're possessed of aspects of Both binaries.
It's valid to be enby just because Neither extreme applies or appeals.
It's valid if you're something Totally different and unattached from any human concept of gender.
It's not a Trendy thing, it's the discovery of a category of identity outside a stifled, heteronormative view of society and humanity.
So don't worry about it so much, worry about climate change or something important instead.