Inverse Solipsism
This is the name I finally put to something I have felt for a long time. I struggle to understand that I exist to other people, can be seen, have opinions or thoughts held about me. I feel that when I am no longer in the presence of someone, I cease to exist (of course, I know logically this isn't true.)
This is the same principle as solipsism, the belief that oneself is the only thing that is 'real'. Except, I feel in a semi-subconcious way that I am the only thing thay is not provably real, as soon as I leave focal points of the peefeption of others I cease to exist to the world.