No one belongs anywhere :) No, seriously. You think I belong here? But you have no idea what goes on in my mind, and how this site fits into my daily life. Belonging anywhere is totally an illusion, is only an appearance. Real situation is always a lot more complicated, full of inner contradictions etc. Relax. We are all like this.
If you take me for example, I don't identify with (do not belong to) any Buddhist tradition. I have a lot of respect for every tradition, but I also have a lot of issues with one-sided attitudes inherent in almost any tradition. They all define themselves via "and here's where our opponents are wrong - and that's what makes us right". And yet, I keep swimming in the sea of traditions - answering questions as they pertain to Theravada, Mahayana, Zen, Tibetan Buddhism etc. But if you ask me what I really think about Buddhism - it's nothing like what we're talking about here. Imagine what that means for my feeling of "belonging" here or anywhere.
As for your affinity with nonduality, what can I say. If you ignore all that Buddhist mythology and terminology that we spend so much time discussing here, and just focus on the end result (whether in Theravada or Mahayana) - you will see that the final Buddhist answer to people's problems is firmly in the area of experience, not ontology. Ontological speculations in Buddhism are only as valid as skilful means that lead to experiential liberation. Experiential! Herein hides the key to your dilemma. If we take nonduality as an ontological state of things - with all its validity - it may or may not have any liberating effect on an actual human being. And if human being takes nonduality as his/her frame of reference, they may or may not achieve full liberation - depending on whether they have any other mental or emotional hangups unaffected by the realization of nonduality. See what I mean?
If we take nonduality as simply the state of absolute all-inclusive totality, with no reference point, it may be too remote from someone's experience to actually make difference to their personal dukkha. But if we learn to not hold on to any fleeting experience, and to not get caught up in any categorization, and to not make any concept our ground - then and only then we're adopting the true spirit of nonduality - without even making nonduality an object of our mind. "Tao we speak about is not the actual Tao" - remember? Same way, nonduality as our description of the ontological state of things is not the actual attainment of non-attainment of nonduality. Having no attachment is.
You can even see this in your present situation. Insofar as you identify with this concept of nonduality, you keep on fabricating some kind of barrier between "you" and "your perspective" and "Buddhism" and "our perspective". That's a typical case of duality! Now if you actually take nonduality as your modus operandi, and drop your identification with it as a reference point - you will break right out to where you think you are, except you will no longer stand on the concept.
I hope this makes sense. I just want to emphasize the big difference between "Brahmanical" kind of nonduality "I am one with the Universe, what you call God, and Spontaneously exist as self-illuminating Gnosis" -- and the Buddhist kind of nonduality of which we can't even say anything because it's not found in any single state of mind.
If that's where you are, then you totally "belong" in the same place where I belong, which is no where. And then for the sake of being able to communicate with your fellow "nondualists" you may want to study the language of Madhyamaka (if you are a rational type) or the language of Prajnaparamita (if you are an intuitive type). You don't have to be lonely.
But then if you truly feel that you want to be a Brahmanical type of nondualist, then you can go and seek the community of Adyashanti's students. There is nothing wrong with seeking the company of likeminded people.
It's all good either way! Hugs....