Human beings are irreducibly non-separate, non-individual, beings
How individual or alone are we? One of the primary signals that we are separate and alone is the fact that we have physical boundaries like skin and cell walls. How alone is a cell? It has a boundary that separates it from every other cell in the body but cell membranes are permeable, they let some things into the cell from outside the cell, and they allow some things to leave the cell through the cell wall. There is water inside the cell membrane and water outside the cell membrane, the only differentiation relative to the water is the cell membrane. The structures that form on the inside of the cell wall also use and participate in the flow of the water across the semi-permeable membrane of the cell wall.
All separation from the surrounding environment for any particular structure seems to follow the same general pattern. The separated structures we see and animate, are constructed out of the material around them and don't have an existence independent from these materials. The life forms and self-definition, separation, we experience is real, and at the same time completely interdependent and intercommunicative with everything around it, or not separate in any absolute sense, not truly alone. The paradox of individuality is that while it is irreducibly true it is not absolute. The non-individuality of the self is equally irreducible and not absolute.