What causes you "great grief and constant pain"? (Rm 9:2) Paul's grief and pain were due to the fact that not all the Jewish people had accepted Jesus as their Messiah, Lord, and God.
Do you want anything so badly that you would even "be separated from Christ" and go to hell? (Rm 9:3) Some people want power, money, sexual pleasure, popularity, success, or revenge so much that they choose to go to hell. Paul hypothetically asserted he would go to hell if this would help the Jewish people go to Jesus and heaven.
Why would you make yourself a slave — even "the slave of all"? Some people make themselves slaves to alcohol, nicotine, other drugs, money, pornography, their businesses, fears, or anxieties. Paul decided to be "the slave of all so as to win over as many as possible" to Jesus (1 Cor 9:19). All that he did was "for the sake of the gospel" (1 Cor 9:23).
What are you compelled to do? What is the driving force in your life? Paul was "under compulsion" to preach the gospel (1 Cor 9:16).
A few days ago, we celebrated World Mission Sunday. What difference has it made in your thoughts, motives, actions, and life?