Dealing with people you don't know I would understand as seeking help from someone in a store, calling insurance agent things like that. Your presentations IMO are not really dealing with people.
Maintaining a friendship-I would say can't do; "friend" is often understood as someone other than a spouse
Getting along with people who are close to you-since your wife is the only one close to you and you get along well, I would say none
Making new friends: you don't do this so I would say "can't do"