Romans 5:1 is the key verse
Therefore, since we have been justified through faith, we have peace with God through our Lord Jesus Christ,
Although we are living in this World, we are not of this World... We don't own our self, as we are God's property and HIS vessel.
Apostle - are the ambassador, representative of Christ.
Mission - is bringing the Gospel to those who haven't heard it as in missionary.
God wants to use us for this purpose.
“Before I formed you in the womb I knew[a] you,
before you were born I set you apart;
I appointed you as a prophet to the nations.” ~Jeremiah 1:5
We have the Holy Spirit of God to know our calling. Read Titus 1:2
God wrote that all of us will be the beneficiary