I get this a lot too. Like I'm not real, my body isn't mine, my voice isn't mine and the words are coming out but I don't know how I know them. I don't feel the world around me is real. It's too weird. Felt like this for a good 15 years and felt I'm going insane. I've even asked people before if I'm really walking because it doesn't feel as if I am. It's tough to explain.