Unstable sense of self can be a thing of BPD. It can be stronger or weaker.

I don't have BPD or DID, but I have a VERY unstable sense of self. I don't really know what to call it, I wish I had a good word for it and that it would fit in somewhere. In my life I've gone through phases, almost like a teenager trying new things, just that I'm an adult and it goes much deeper. Those past me's live somewhere inside me, but if a trait of them comes out, it immediately gets in conflict with who I am "now", because it feels that this personality should not have that trait.

When I've changed, I've changed preferences in food, music, clothes, activities and also changed beliefs, morals and view of the world.

I had times where these states existed together in time but took turns, but the norm is they stay around for a few years, then something changes. When things change, I change inside how I feel about myself. The feeling of "me" is different. When I'm between identities I feel raw and stripped to the bone in a very unpleasant way. When I'm not in the mood for the identity I am, I feel grumpy and strange. When I'm in a different identity I look down on the others with disgust, like that is so not me! Still when I'm there, it mostly totally feels like me.

Something is quite unusual about me, but no one ever caught that. Maybe it doesn't show so much on the outside?

I know someone who is a bit similar to me and they are diagnosed DDNOS. But they have a reason to be dissociative, I don't.