As you can see in the title, I'm quite confused and stressed about who I am. At first I thought I was gender fluid, but I don't really feel right calling myself a girl or kind of like a girl at all. Due to this I then thought I was gender neutral, but after going over it in my head I feel like I'm more masculine than neutral. I know I'm not a guy, and I wouldn't class myself as one but I am not gender neutral. Is it possible for there to be a gender in the middle of neutral and male? And if so what is the term used for it?
There is masculine agender. There is also demi-boy. Bi gender can mean you are gender neutral and male.
Yeah transmasculine would apply to you, though it is used more to describe presentation than as an actual gender identity (but not exclusively so). You could describe yourself as non-binary male or genderqueer male etc.
Transmasculine is an umbrella term that describes any dfab person with a gender identity from neutral to male (e.g. male-leaning nonbinary, trans men, etc.). I personally used it for quite a while to describe my gender identity because I too felt that I was somewhere between neutral and male, and none of the more specific terms felt right.