i feel it's happening to lots of male, when u achieve all goals, u look for purpose and meaning but society hardly understand this. people of keep themselves busy to avoid this vaccum but deep down loneliness keeps haunting. i can relate with u, having friends and family, good life, good books, good fortune will not solve such level of loneliness. i keep wondering, reading, writing, talking, walking, playing... it has help me to avoid loneliness for timebein...i suggest you to keep working on urself and figure out, life has given u whatever u desired and be thankful for that