Does every Christian have a calling and can a Christian miss his calling?
At the moment of salvation, a new purpose or calling is present in the life of a new believer. Some will be missionaries, others pastors, teachers, deacons, elders, and ushers. All believers, though, are called to be lights in this dark world and to live as loving examples of Jesus Christ before friends, families and acquaintances.
While some individuals are called to a larger ministry, God has commissioned each and every believer with the calling to share the Gospel with others. Matthew 28:19-20 says, "Go therefore and make disciples of all the nations, baptizing them in the name of the Father and the Son and the Holy Spirit, teaching them to observe all that I commanded you; and lo, I am with you always, even to the end of the age."
It is certainly possible for a believer to miss his calling. Doubt, fear, laziness, feelings of inadequacy, and lack of faith--those are all perfect excuses for why someone would deny the leading of the Holy Spirit. It would be a terrible thing to have been called by God to reach His people and then have to stand before Him and say, "But God, I wasn't good enough." Not only would you be telling Him that He made a poor choice, but also that He made a poor creation. God is powerful enough to equip you to do whatever
He sets before you. Allow Him to work in your life and lead you into His plan for you. He will never leave you alone; He will work through you if you let Him.