Is It All A Dream?

Have you ever wondered how much of what you believe is true and how much is not-true? (Not false, just not true. I see a difference, here) As human beings we simply need to have certainties in our lives and we might wonder if what we have believed for a long time is actually a reality or if it's just the fruit of our imagination, the result of our wanting to believe. As a consequence, we might wonder if what we do has a real meaning or it is just an illusion. Physicists are telling us that the entire Universe can be considered as a dream, created by our choice to observe it. Therefore it can be considered as a creation of thought. Quantum physics is the science of possibilities (as it has been defined) which tells us that REALITY is not real at all, it's just an undifferentiated ocean of energy where nothing is stable, where nothing has a shape, where nothing has a mass (=substance), where even space and time do not exist. I apologize if some find this topic boring or useless. For me it is almost a matter of life or death, from a psychological (as well as spiritual) point of view, because knowing is a necessity of the spirit. Socrates said that he only knew that he knew nothing. Should this be comforting or depressing? In spite of all our studies, our progress etc., what do we know for certain? You might say that we know that we see images on TV, that we speak to far away people on the phone, that we get light by pressing a switch, that we drive a car. Fine. But... do we understand what is this all about? How important is all this for our deepest needs? Unless you believe that this material life is all you have, you cannot be satisfied with the answers given so far.