I also experience this. All the posts above describe it so much better than I can. It is like the world isn’t real, I can be standing in a room and I feel like I could put my hand through objects. Either they don’t exists where I am or I don’t exist where they are. I often felt like I was looking at an almost transparent image of myself and asking myself what the hell was going on. Used to be quite scary, not so much anymore and doesn’t last long.