Transition is not necessarily points moving across a spectrum line.
It can be the whole spectrum at once.
Fear can interfere with your self perception of gender, but deep down in your core you know who you are.
I transitioned fully to mtf trans, in a binary transition, no ops. Will I change the bottom? who knows.
But I am nonbinary, and an androgyne. I also live as a woman. It depends on the social situation, my mood, different things, but what does not change is me, who I am. And I am not a woman, nor am I a man. So I am nonbinary.
I am also mtf trans by definition. I have a complete transition. And I won't wear mens underthings, no way. Its not who I am physically, phsically I am mtf trans, sexually I am mtf trans.
But my core is me, and that is not going to fit any gender stereotype or label.
Regrets? About transition- my 4 years of high dose estrogen shots? NO. None. I know I need this body, this me, this look in the mirror.
But the question to ask is, what would you regret? What specifically are you worried about regretting?
I already have my children, there is that part of things. And living trans is a big deal, its not easy. I live it. I am full time sh'e. But sh'e has many presentations.
There is a concern about a pendulum swing, to move away from the female target, recenter in the middle. So long as you don't deny a part of who you are, repress it, it is ok. But when you suppress part of your gender identity, things have a way of popping up on you, truth eventually will always find its way out.
There are many nonbinary mtf transfolks out there. They may not admit it, not really, but they know well they are "more than women". And there are many binary transfolks out there too, and they are women through and through.
There are a thousand ways to be trans. Live your truth, who you are, deep down inside, eyes wide open, heart wide open, feeling the feelings and being who you really are. Gender for me is simultaneious and a symphony. Not a point on the line. Its the entire line, formed into a circle, a sphere. Formed into the diamond heart of trans.