When we hide from the world in this way, we feel secure. We may think we have quieted our fear, but we are actually making ourselves numb with fear. We surround ourselves with our own familiar thoughts, so that nothing sharp or painful can touch us.
While you're meditating, all kinds of thoughts arise... You don't find your thoughts threatening or particularly helpful. They just become the general gossip of your thoughts. This traffic of your thoughts and the verbosity of your mind are simply part of the basic chatter that goes on in the universe. Just let it go through.
Good and bad, happy and sad, all thoughts vanish into emptiness like the imprint of a bird in the sky.