The concept of you is no different than the concept of a character written down on a page. They both exist in abstract. The difference is that you are given mobility in the material world, but it's only to provide a means to an end; which scientifically is to evolve into another life form larger and more unified in their inclusion and completion. Humanity is only one stop on the journey of evolution and the concept of the individual you only exists as a byproduct of the ego, which only exists to keep you alive in the most survivalistic sense. The ego, your material body, the universal consciousness are all different.

The ego is the idea of you, the way you see it without any introspection whatsoever. Your every day waking life is the embodiment of your ego and your sense of self. It creates selfishness which is a bad thing, but it provides the gateway to empathy and subjectivity, which are good things. In the end, however, you and your subjective experience are just transient parts of the universe. They may be so fleeting as to not really matter, but your ego does provide a sense of attachment to yourself and the material world, so that you don't just shove off for the next experience.

My personal take on the universal consciousness, which I think we share in unconsciousness of death and sleeping, is just a montage of possible experiences. Experience itself is so non-material, it helps to almost empirically devalue the assumptions we make about the material world being "real." These are phenomena that transcend /r/psychonauts. I highly recommend watching Through The Wormhole. It's by far some of the most exploratory and scientific existentialism that only makes you feel warm and fuzzy about how synergistic the abstract science seems to coincide with a lot of psychonaut concepts about reality. It's amazing stuff. There are episodes dedicated to exploring the concept of a living universe, transfer of consciousness, the illusion of time, higher dimensionality, etc. It really could not be in the wheelhouse of this subreddit any more dead-center without losing mainstream credibility, which it oozes.