In our culture, this expansion of consciousness or "rite-of-passage" usually happens when a couple has children. Unfortunately, if one of the couple is not emotionally involved in the child entering the family, that person may not experience the rite-of-passage and remain in the "I"consciousness. This often happens with divorces or separations, as well as, someone who chooses to continue to be self-involved. Fathers are more susceptible to this separation from the "we" of the family- as they may not get the attachment and involvement with the child during pregnancy. They remain stuck in the "I" consciousness of adolescence. You then have a couple with two people living in different worlds.
Therefore... it is essential to create a rite-of-passage into "we" consciousness upon entering a relationship, family, or community. Both the mother and father need to be involved in what is happening in the family. This is why it is so important for the father to go to things like a Lamaze class or help paint the nursery. If you do not have children, you owe it yourself to create this expansion of consciousness by becoming part of something greater than yourself.
On the up side... you will no longer feel so alone.