maybe you're just pretty even on the E/I axis? Does it really matter which side of the line? Surely it's a difference of degree rather than of kind (unless we get into all the somewhat mystical sounding obsessions about "function order" which while very interesting, I ultimately find to have little application in reality).
I had a lot of doubt about my MBTI, and then I realized, that ultimately it was just insecurity due to my life circumstance that was driving me to seek some kind of "answer" in MBTI. But really the answer is in looking at your own strenghts and weaknesses
broadly . For example I'm good at arguing a point, at imagination and grasping concepts, and I'm bad at being sensitive. Whether it's "Ni" or "ne", or "Ti" or "Te", who gives a fuck? They are differences of degree not of kind as I said, if you look at the descriptions, we all do all those things and they overlap.
In your case if you have strong intuition and thinking, why is it so important to know which one is "dominant". XNTJ seems like a fine description, you're neither a withdrawn stereotype, nor some cavalier person with no ability for reserve and introspection. Drawing some line at the 50% point which then supposedly predefines a whole load of other shit, seems unnecessarry.
I hope that offered some help anyway. If it didn't, I ask to be excused, it was meant in a helpful spirit.