I don't know if being transsex is completely incompatible with being non-binary. Maybe I'm not using both words in their exact meaning, but I'll try to explain what I mean (sorry if I have some English errors, I'm not used to explaining this in English).
I'm still defining who I am, as I have written in some posts, and a bit lost. First of all, I separate the concepts of sex and gender, I see sex as a form of body expression (you have the characteristics of one of the sexes, or sth in the middle; and it is not something really fixed, you can change it in the "physical" part of transition, for example) and gender as a social construct and a way of being (adapting to the roles and behaviours of one of the numerous genders, and most important, what you feel about it -you feel like a woman, like a man, like sth else?-). Well, then sex for me is a physical concept while gender is more a social-mental one.
I also have a kind of struggle trying to know if I'm MtF or(and?) non-binary, and I don't really know yet (I consider that some of the best ways is experimenting with your gender identity if you can find a safe place or a support group). What you ask is something you only can answer, but, if it helps, this is how I feel: starting from the difference between sex and gender as I have understood it, in the view of gender I don't really have a special definition, in my inside I feel like if I was agender, I do not identify with the roles assigned to any gender and I think that imposing one on me would be somewhat limiting in what I can or can't be personally in the future (although I have an especial rejection of male roles and identity). I feel freer if in my interior there's no gender tag.
Nonetheless, talking about my body expression, since I started to question my gender and my body I've never liked being read as a male exteriorly, always hated the roles, the pronouns, the way of life, the social meaning of being a man... imposed on me because of that and looking at the mirror and seeing that. Even though (I think) I feel agender in the inside, I have a real desire of being read as a woman in society, I do want to have a female body at the same time I do not identify with any gender interiorly, and this is something that really strikes me.
For years I've seen this as a contradiction, and I'm still in the struggle of solving that. However, I'm starting to believe that maybe those are not actual contradictory ideas, maybe they can be separated? Maybe one is only about your feels and mind and the other is about your "gender performance", as some genderqueer theories propose?
You can make yourself this two questions: "how do I feel inside, who am I?" and "how do I want to be read in society?". To my mind, the answers don't need to match, you're the only entitled to answer this for you and every answer concerning sex and gender is as legitimate as any other.
This is what is working with me, and I really hope it can help you.
Hugs,
Q.