If forced, I might denote my special identity to be (as described by gender wiki)
Agender, due to "Not knowing or not caring about gender, as an internal identity and/or as an external label."
Genderqueer, as "Those who do not or cannot place a name to their gender"
Non-binary, since at best I "Have a neutral or unrecognized gender identity, such as agender"
And also (from stonewall): "Non-binary
An umbrella term for people whose gender identity doesn’t sit comfortably with ‘man’ or ‘woman’. Non-binary identities are varied and can include people who identify with some aspects of binary identities, while others reject them entirely." since the stereotypes used to define 'woman' and 'man' in these examples are outdated and oppressive.
Though, as @Metabigot says actually Cassgender is probably the closest: "Cassgender is a gender identity where one feels that their gender is unimportant, or is indifferent to the idea of gender. Cassgender is unlike agender, as a cassgender individual might identify as a particular gender, but they don't feel it is an important part of their identity."
When it comes to pronouns, it's an important part of my identity that I don't care about gender and so I will live my authentic truth by using sex-based pronouns. It would be phobic to compel me to do any different.
As such a special human I expect my opinions on everything to be given the proper attention and protection such special humans deserve. Thanks OP for bringing this opportunity to truly find my authentic self.
There, I have come out. Celebrate ME.