I thought that was a pretty common thing to feel? I mean, the different personality thing. I had never thought about things not feeling so real... I'm gonna definitely meditate on that one for a while I also got sad when i started replacing my native language with English in my thoughts, and pushed myself to think in Spanish again, have more Spanish speakers around me etc. since i no longer live where i learned my native language, i speak a somewhat "foreign" to myself version of it, which introduced a new type of sadness - that of not being recognised as a local in your own home, losing a specific kind of personality that's bound to a specific place- but that's one I've learned to live with