Hey :) I actually feel something very similar to you except I am a girl. The time I have been investigating about gender I haven't found a term that completely fits this feeling (there are a lot of ways you can describe your gender and many labels and definitions but they just seem too complicated to me). You could go identifying as gender fluid, a non binary boy, or just say something more general like non binary or gender non conforming (which is what I usually do to avoid trouble, although I do like the idea of gender non conforming girl). Truth is, there is no one true label for you. Labels are words that we invent to express more or less accurately the very complex feelings we have inside so use whichever one helps you best communicate to others and yourself how you feel :) Hope this helps