The position you're describing is either solipsistic (I am the only thing that exists, all else is illusion before me) or it is religious (we are al Brahman, the division of the world into things is Maya, illusion).

I fully agree that there is no way to prove this position is wrong, but I think you also have to accept that you can't prove that materialism is wrong. I would say materialism is more useful than solipsism or transcendentalism, but this is a subjective assessment.