Galatians 2:1-3

¹ “Then after an interval of fourteen years I went up again to Jerusalem with Barnabas, taking Titus along also. ² It was because of a revelation that I went up; and I submitted to them the gospel which I preach among the Gentiles, but I did so in private to those who were of reputation, for fear that somehow I might be running, or had run, in vain. ³ But not even Titus, who was with me, though he was a Greek, was compelled to be circumcised.”

Here we see that Paul submitted his Gospel to the church in Jerusalem. This was to confirm to himself that he had not run the race in vain or had been preaching a false Gospel. 

Compelled to be circumcised: This verse says something of the peer pressure that was surrounding Paul and Titus. Titus, a non-Jew, was evidently pressured into being circumcised. But Titus resisted this pressure and chose to not violate the Gospel by combining it with law. Titus was not concerned about people pleasing.