Paul wanted to preach Jesus and leave himself out of the message, yet, he was an apostle of Jesus Christ, and Paul was the man people first met before they learned about Jesus. Therefore, he could not avoid referring to himself some.
Members of the church at Corinth questioned Paul’s apostleship, which meant that those people would ultimately question the Lord, for He was the One who appointed Paul as an apostle.
Therefore, he had to prove who he was and that was not easy for someone who really wanted to talk about Christ, as Paul said,
“Of such a one I will boast; yet of myself I will not boast, except in my infirmities. For though I might desire to boast, I will not be a fool; for I will speak the truth. But I refrain, lest anyone should think of me above what he sees me to be or hears from me” (2 Corinthians 12:5-6).
When you have to talk about yourself, do it clearly and without fear, because it might be necessary to do it to promote a greater good.