I don't have this at all. In fact I've often struggled to understand what people mean when they say things about "sense of self", as they sometimes do when they discuss ASD in women (and BPD, too), because I don't (and can't) really ever change who I am, how I respond, what I enjoy, how I speak, or how I come across to others, or at least not that much.
Not because I don't wish I could adapt better to different situations; I do, but I can't sustainably modify my responses much beyond my base-level "pretending as far as possible to be the version of myself which is most similar to a normal human being" thing. This more complex, nuanced, changing myself depending on the people and the situation thing, that's beyond me TBH — my friends, my family, my partner, my lecturers, random strangers, they all get essentially the same experience of me as far as I can tell.
MNers might get a slightly different version of me because this is text-me, speaking in my native mental format. And because it's anonymous, it's without one or two of the inhibitions I put in place for RL interactions. But basically I'm not a different version of myself, just one that's communicating more freely.
So when "sense of self" comes up, I can't make it make sense for me and my psychological landscape — I guess I don't have a "sense of self" per se, because I don't have a sense of being anything other than self, so how can I have a sense of self? It's like asking about my sense of humanness, when I've never been anything else but human. I'm me, nobody else is me, I can't be anyone else, that's as far as my sense of self goes. I'm confused now 