Hmm, I don't really know how to help with this, but I would say you don't need to know. These things are super complicated, and hard to figure out ok? You don't need to fluctuate between all genders to be genderfluid ok? And if you feel like Demi-boy or another label fits you better, then it does. And as for the trans flag, If you're not cis, then you're trans. because you aren't female you would fall under the trans umbrella, but the more complex and percise labels are more difficult.