Probably social and internal/emotional world.
Though social not as many would interpet it that hard to get along or form relationships, that part can be easily "faked"/managed. Social side from personal internal perspective which is connected or effected by the emotional difficulties.
For me the internal side of relationships might as not exist. All of the emotions or drives that most people consider to be the main reasons for relationships, pretty much don't exist for me. Like the "connection" or "love" or "companionship", "missing someone", "wanting to be with someone", etc are just theoretical concepts in google/textbook for me.
Pretty much like im completely missing one of the most fundamental things that makes us human.