I personally think that it's not an out of the body experience and it's only in our mind because the preparation for the astral projection/travel includes exploring and remembering the environment around us (especially the room where we do it) with the help of many methods (putting different smells on different parts of the house for example in order to make a connection with the unconscious). Personally I have never experienced an astral projection/travel, but I have experienced many times lucid dreams and I think astral projection/travel is actually getting into lucid dream consciously which begins with visualizing the astral body separating from the physic body.
Knowing that you may protest and disagree with me, I would like to ask you for your opinion although.

(Sorry if I have made mistakes...I'm not an native English speaker)