Pirkei Avos – Torah.org: “Only we can fulfill that most basic and fundamental commandment of all: Know thyself. ”
And that is the real challenge that we face through life, trying to understand who we are and what we stand for. This is something that evolves through time as we grow and evolve. At least you hope that you do not stagnate and that you do continue to grow.
We can find guides and recommendations on how we should live, but we cannot let others live our lives. They may share in it, but they can never truly feel our feelings or understand our thoughts. In some fashion we are always alone. But this is not a bad thing.