Paul, a servant of Jesus Christ, called to be an apostle, separated unto the gospel of God.
Romains 1:1 (KJV)
We find the term "Servant" throughout the New Testament. Almost all the apostles begin their epistle by identifying themselves as a servant and apostle of Jesus Christ. Even Paul, in all his epistles, calls himself a servant. Some versions, like Darby, use the expression "Slave" which has the same meaning. What does it really mean to be a servant of Jesus Christ?
To be a servant implies complete obedience to his master. It also expresses the idea of completely renouncing his rights and priorities to be at the service of his master. This is what the apostles demonstrated in their letters, self-denial to serve Jesus. Yet in John 15 verse 15 we read, "I no longer call you servants...but I have called you [My] friends." This means that although His servants, Jesus considers them as friends through whom He accomplishes His work of salvation.
Do you just see yourself as a Christian or do you see yourself as a servant of Jesus Christ? If you are a Christian, know that it is the one who joins a local church and participates in different spiritual activities to grow in faith. If you are a servant, you are among those who know the desire of his master's heart and obey his instructions. If Christ has called you and set you apart, it is to announce His gospel to those who are lost. So get to work and begin to accomplish your mission as described in Matthew 28:19-20 (Read it).