It is a difference of being alone and lonely. As I figured it is a skill to be alone and we usually avoid it because when the loneliness hits, you must deal with yourself and your thoughts. We occupy ourselves with work, relations, social media, doing-ness....so the mind is busy.
exactly, we always keep ourselves busy to avoid the feeling of loneliness. Being alone can be be a joy, being lonely is to be focused only on one's own self and eventually leads to isolation and sorrow.