Galatians can be twisted (as Peter warns of Paul’s writings).
Paul was trying to convey certain things, while not concerned with others.
When he explains his conversion, he emphisizes that he did not confer with flesh and blood. Which is true, but he also was told by Jesus to go to Damascus and meet Ananias where he would be told what to do (and healed, given the Holy Spirit through Laying on Hands, and Baptized). And he also stayed with the disciples for some time.
Paul was distinguishing how he learned of the Lord Jesus, and His Gospel. So he did not learn it from the Church, but by Jesus Himself. This was all to say that he was a genuine Apostle, and that being an Apostle, though ultimately comes with glory, is not something to be desired and pleasant.
So off he went to attest to what was revealed to him. But who was he compelled to go see?
Galatians 1
Then after three years I went up to Jerusalem to visit Cephas, and remained with him fifteen days. But I saw none of the other apostles except James the Lord’s brother. 20 (In what I am writing to you, before God, I do not lie!)
This is significant to your question. Because why does Paul specifically visit Peter in Jerusalem, and stay with him for 15 days, and only mention James as kindof a side note of also seeing him?
Then after 14 years, he retutns by way of revelation to lay before the hierarchy of Apostles (privately) the message he was preaching. And why?
He said, “lest somehow I should be running or had run in vain.”
So he was seeking Confirmation first, and then support to move with the Church.
Paul was being humble and seeking God’s Confirmation through the hierarchy. He was not seeking flesh and blood advice, but divine will.
Paul was very wise to know how to seek God in the Church, yet distinguish weak behavior in Church members.
And even though Paul recognized that Jesus had a mission to preach to the Gentiles, it was still through Peter whom Jesus provided the Gentiles to first hear and accept the Gospel, and be granted the Holy Spirit. And Peter silenced the Jeruslem council with this reason, and declared that the Gentiles should be received.
Peter did not need the Apostles to Lay Hands on him and give him his mission, but Paul was commissioned through the Church:
Acts 13
While they were worshiping the Lord and fasting, the Holy Spirit said, “Set apart for me Barnabas and Saul for the work to which I have called them.” Then after fasting and praying they laid their hands on them and sent them off…So, being sent out by the Holy Spirit, they went… and they had John to assist them.