Hi hon.
It can feel horribly disconcerting to just feel undefined. Your description of never having a gender identity is non-binary it falls under the agender spectrum - the camp in which we are firmly placed. Neutrois is where we feel some kind of identity, but it is neither one side, or the other - again under the non binary agender umbrella. The whole non-binary space is complex, as it's trying to define 'everything else'. Bigender, trigender, gender fluid, agender, the list goes on, as quietly we slip out of the shadows and talk of our experiences, and that's before we even start talking about dysphoria or clothing....
We have a part that is feminine, but are also mainly agender/neutrois, so even as a non-binary it's complicated.
Our wiki, is a good place to start - in the end it's about finding a way for the world to recognised the real you, without us having to 'act the part'.
(Hugs)
Rowan