"... so that I may finish my race with joy, and the ministry which I received from the Lord Jesus ..." (Acts 20:24)
Joy comes from seeing the complete fulfillment of the specific purpose for which I was created and born again, not from successfully doing something of my own choosing. The joy our Lord experienced came from doing what the Father sent Him to do. And He says to us, "As the Father has sent Me, I also send you" (John 20:21). Have you received a ministry from the Lord? If so, you must be faithful to it - to consider you life valuable only for the purpose of fulfilling that ministry. Knowing that you have done what Jesus sent you to do, think how satisfying it will be to hear Him say to you, "Well done, good and faithful servant" (Matthew 25:21). We each have to find a niche in life, and spiritually we find it when we receive a ministry from the Lord. To do this we must have close fellowship with Jesus and must know Him as more than our personal Saviour. And we must be willing to experience the full impact of Acts 9:16 - "I will show him how many thing he must suffer for My name's sake".
"Do you love Me?" Then, "Feed My sheep" (John 21:17). He is not offering us a choice of how we can serve Him; He is asking for absolute loyalty to His commission, a faithfulness to what we discern when we are in the closest possible fellowship with God. If you have received a ministry from the Lord Jesus, you will know that the need is not the same as the call - the need is the opportunity to exercise the call. The call is to be faithful to the ministry you received when you were in true fellowship with Him. This does not imply that there is a whole series of differing ministries marked out for you. It does mean that you must be sensitive to what God has called you to do, and this may sometimes require ignoring demands for service in other areas.