I feel this way too. Often when something else has caused me to want to escape from reality, like anger mostly. Sometimes I just get so mad at my partner I cant even say anything and it is like I disconnect from my own body and am seeing the world move around me. I call it the 'inbetween' because I am here but not here. There are times when I cant even get comfortable laying in bed because I dont feel like it is me who is laying there, if that makes sense. Honestly there are times when I do not mind this feeling of being in the 'inbetween' it keeps my emotions from bursting out.