Actually, being somewhere in the middle is likely the most common and natural form of gender variance. It has been discovered recently that neurologically everyone, except about 2%, are a blend of male-like and female-like gender behaviors along with a big pile of intermediate traits and characteristics that both male and females engage in fairly equally. The question is what is the details of the blend? Is it more heavily female-like as is the case in, well, females or is it biased more toward the male-like traits and characteristics, or is it an almost equal blend of everything? Everybody is unique and the balance changes constantly as you experience new things. There is no right or wrong way - there is just what is right for you. You likely have both strong female-like and male-like traits and characteristics and that is why you are most comfortable somewhere in the middle. Don't be surprised if the blend shifts one way or the other, both on the short term and the long term. It is all "designed" to do that. It is adaptation to what is experienced.
That is why the rule is that there isn't any rule. Although gender and gender expression is a social aspect in our lives that defines what YOU see is your role in society, the details of what fits best is largely personal. And if everybody accepts that it is personal there should be no problems with groups or stereotypes or tribal behavior forming. Unfortunately, we constantly seek out a definition that often is based in some "group" such as cisgender, crossdresser, transgender, non-binary, etc. It is all a bunch of BS but apparently necessary.
Be yourself and enjoy the life you were given. But be aware that others may disagree. Be kind, gentle, and respectful of others. Usually works pretty well, no matter what you gender presentation indicates.
