Well, there are going to be Apostles and Prophets and already many have been raised up....believe it, don't believe, doubt, worry, and stress about it but it isn't going to stop God from doing it....it is in His word. Paul wrote epistles saying he was an apostle
example:
Colossians 1:1 1
Paul, an apostle of Christ Jesus by the will of God, and Timothy our brother, 2To the saints in Colossae, the faithful brothers in Christ: Grace and peace to you from God our Father
1 Corinthians 1:1 1Paul, called to be an apostle of Christ Jesus by the will of God, and our brother
Sosthenes,
2 Corinthians 1:1
Paul, an apostle of Christ Jesus by the will of God, and Timothy our brother, To the church of God in Corinth, together with all the saints throughout Achaia:
Romans 1:1 Paul, a servant of Jesus Christ, called to be an apostle, separated …
Ephesians 1:1 Paul, an apostle of Jesus Christ by the will of God, to the saints …
Pulpit Commentary
Verse 1. - Paul, apostle of Christ Jesus through God's will, and Timothy the brother (
Ephesians 1:1;
2 Corinthians 1:1).
The apostle designates himself by his office, as always, except in the Macedonian Epistles and the letter of private friendship to Philemon.
Gill's Exposition of the Entire Bible
Paul, an apostle of Jesus Christ,.... The apostle puts his name to this epistle, by which he was known in the Gentile world, as he usually does in all his epistles; and styles himself "an apostle", as he was, having seen Christ in person, and received his commission, doctrine, and qualifications immediately from him, with a power of doing miracles to confirm the truth of his mission.
This he chose to make mention of, partly because the false teachers everywhere insinuated that he was not an apostle; and partly to give the greater sanction and authority, and command the greater regard and credit to what he should say; as well as to excuse his freedom in writing to them whom he had never seen, since he was an apostle of the Gentiles, and so to them; see
Romans 11:13; he calls himself an apostle "of Jesus Christ"; not of men, he was not sent out by men, but by Christ, who appeared to him, made him a minister of his, gave him his Gospel by revelation, abundantly qualified him for the work, sent him forth unto the Gentiles, in whose name he went as an ambassador and messenger of his, and whom he preached, and by whom he was greatly succeeded, to the conversion of many souls, who were seals of his apostleship in every place,
1 Corinthians 9:2, into which office he came
Colossians 1:1 Paul, an apostle of Christ Jesus by the will of God, and Timothy our brother,