Paul was specifically appointed to the Gentiles (anyone who isn't a Jew).
Rom 11:13; But I am speaking to you who are Gentiles. Inasmuch then as I am an apostle of Gentiles, I magnify my ministry,
1 Tim 2:7; For this I was appointed a preacher and an apostle (I am telling the truth, I am not lying) as a teacher of the Gentiles in faith and truth.
Gal 2:7; But on the contrary, seeing that I had been entrusted with the gospel to the uncircumcised, just as Peter had been to the circumcised
That last verse could be re-written as ... I taught the gospel for the Gentiles, Peter taught the Jews.