Not my area, I’m a physicist and have never studied psychology.
I usually check Wikipedia for stuff like this. Wikipedia is great, but it’s not always correct. Best way to go is to read the article on Wikipedia and then start following the links. In this case it tells me
Depersonalization disorder (DPD) … is a mental disorder in which the person has persistent or recurrent feelings of depersonalization or derealization. Depersonalization is described as feeling disconnected or detached from one’s self.
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