One more time. James, cousin of Jesus, son of Zebedee, Pastor of the Jerusalem Church was martyred by Herod around 42 A.D. (Herod dies in 44 A.D.)(Acts 12:2,23). 14 years after his first visit, after completing his first missionary tour and spending time at his home church in Antioch Paul goes up to the meeting at the Jerusalem Church over the evangelizing of Gentiles, around 52 A.D. and James the Lord’s brother, is the Pastor and leads the meeting (Acts 15). he writes the letter to the Galatians sometime after the meeting around 54 A.D. some 10 to 12 years after James, the Lord’s brother had been appointed Pastor of the mother church at Jerusalem. The letter was written to elaborate on the former letter to the Gentile churches resulting from the Jerusalem meeting. The church knew who Peter was since he had disgraced himself in their presence and they knew James was the Pastor of the mother church, and both at the time of the writing of the letter were apostles and Paul was using his association with them to establish his own credentials with the Gentile church. He was not commenting on the history of the Apostles or their succession; just identifying the prominent people involved in the dispute.
There is no evidence in the Gospels that Jesus selected His brother to be an Apostle, the two James are already accounted for, and Matthias was appointed to fill the ranks of the twelve when Judas Iscariot was eliminated, so someone had to fill the place as the Pastor and Apostle for James, who was martyred.
It was only after three years that Paul went to Jerusalem to see Peter (Gal 1:18-24) and only James the Apostle (Gal 1:19), not 14 like you state, that was the second visit where he did see apostles.
Paul makes this clear and even states he is not lying (Gal 1:20)
Paul was interested in meeting Peter, why? Because Peter was one with authority. He was the head apostle, and so Paul wanted to speak with him.