This comment made me think about the fact that today Christians are called the body of Christ. In 1 Corinthians 12:27 it says; "Now you are the body of Christ, and members individually". Then you can read in Ephesians 4:16 that every part of the body of Christ has something to supply, or give, to help the body. Too many times as Christians we do not realize the connection we have to one another and how important we are to each other. Often we think it is only the pastor or someone called into full time ministry who is really vital to what God is doing today. The truth is that we are all important parts of the body of Christ. If every Christian would see the value of what God has called them to do and then use the abilities that God has given them to help others it would change how they live and act.
Most of the time we put a high value on the gift and talent that someone else has and we minimize what God wants to do through us. The problem then is that every part of the body of Christ is not supplying what they have and so the body is not as well developed as it should be. Naturally speaking, if only half of our body was functioning we would have a problem. Spiritually speaking, too many Christians are not fulfilling their part in the body of Christ and we all suffer because of it. The answer to the question, "What would we do without you?" is that we will do far less than we should and not be as effective as we could.
If you are not sure about the plan that God has for you or about the gift and talent He has placed in you then ask God about it and get involved in your local church. God will help you see the ability that you have and how you can use it effectively to be a vital part of the body of Christ. Getting involved in your local church will give you a place to start contributing to what God is doing and it will give God something to work with in your life. We all need to understand our own importance to the body of Christ, take our place, and contribute with the abilities that God has blessed us with.