Your calling and purpose in life are determined by God and He will make sure that you fulfill them one way or another.

When Saul persecuted Christians in Acts 8, it lead to the church scattering and preaching the Word everywhere.

After Saul converted to Christ and changed his name to Paul, God used him to multiply the church by traveling and starting new churches that preached the Word everywhere.

God was going to use Paul to spread out and strengthen the church, no matter what. Paul simply got to choose whether he would be a cooperative participant or a frustrated resistant.

You don't get to decide whether you will fulfill your calling, you only get to decide whether you will enjoy it.