existential loneliness

I feel that we as humans are all disconnected from each other. It is as if we lived in a building, and each of us lives in a room, but we cannot visit each other. We may get outside on the hallway and try to talk about our rooms, but we never get to really see or enter each other`s rooms. Do you feel the same way or is it only me? What stops us from connecting? Do you think there is a way we can really connect?