What’s the self awareness of Paul re his office of “Apostle of Gentiles”?

What’s the nature of the self awareness of Paul regarding his office of “Apostle of Gentiles”? Can we say that in Paul’s mind he is appointed the office singularly or exclusively as no one else can say the same in the same sense, or he think he is just one among many laborers? (Ephesians 3:1-2)