Existing on the Edge of Consciousness

Sometimes I think my whole life is like that, not quite "real"...and often a struggle to create and maintain my "reality".  It's like, when I listen to Celtic music, I respond as though I can almost, but not quite, understand the words.  Life sometimes seems that way too, as though I feel I should know and understand how to deal with it, but I am missing some crucial information somewhere along the way.  I often feel adrift, and even the few things that "ground" me, such as people I love, or my house, or my job are still ephemeral and could vaporize in an instant.