Stranger in a strange land

I feel as if I am a stranger in a strange land......a pilgrim passing through......admiring the beauty of this world, taking pleasure in life's little joys...but never fully at peace........longing for home.  How can I be homesick for a place that I've never been to?.....unless I existed before this current life......in some way.  Did we all drink from the fountain of forgetfulness before being born?  Why does the bible say that God "knew" us before we were born if we did not exist yet?  It does not say the God "thought" of us before we were born........and why did God hate Essau even before his birth??  This does not seem fair.... was it because God already knew the future and what path Essau would take?......or maybe Essau had already proven his bad character.....in another life??