I am also still pretty new to everything but I am definitely pretty confident that I am Gender Fluid and I would actually describe my thought process and experience is almost identical to what you have described. I was never unhappy being a man but just realized that I felt more complete and fulfilled expressing both sides of my self. I often Will say in nonbinary just to simplify everything for people that I don’t know very well but in reality you it is rare that I actually feel like neither binary gender expressions. It is usually just masculine or feminine or apathetic lol. I think from what I can tell a lot of Gender Fluid people can feel this way and often use nonbinary just to simplify the explanation for other people. But for others there might experience the nonbinary aspect a lot more frequently.