I think I might experience this a lot. The best way I describe it is by relating it to a movie, Men in Black. Theres a scene where the big 'lurch' looking alien is on the table at the morgue and will smith opens up his face and theres a tiny sweet little alien in there operating all the controls. Thats the best way I can describe how I feel, like the real me in removed from the shell of my body and is cocooned inside. When I have been in very difficult times in the past, under enormous stress or living in unsafe situations, there has been a couple of times that I have gone to walk across a road and not seen a car coming because I've been sort of dazed and out of it. I don't know if that is dissociation or depersonalisation or derealisation and I don't really get how they are different. I think I spend most of my time disconnected from my emotions as a protection mechanism because I have felt so traumatised and have never had the love, safety and support to feel those feelings of terror.