It is called avoidant personality disorder (AVPD) or schizoid personality disorder (SPD). Both of these conditions can lead to feelings of loneliness due to inner walls and barriers that the person builds to protect themselves from perceived threats or emotional pain.
It is a known personality issue.
It is called avoidant personality disorder (AVPD) or schizoid personality disorder (SPD). Both of these conditions can lead to feelings of loneliness due to inner walls and barriers that the person builds to protect themselves from perceived threats or emotional pain.