I know of one church that has over 150 ministries functioning that people can involve themselves in, such as prison, elderly, youth, children, unwed mothers, addictions, motorcycle clubs - even a ministry group for those investing in equities. The danger of not being involved in Christian service is drying up spiritually. As we give we receive. When we do not give we are in danger of drying up - a plum can quickly become a prune. The healthy Christian is the one involved.
Some people never feel adequate for Christian service.
We are all human - and prone to human weakness. Some want to sit and be ministered to, then someday when they are built up sufficiently, then they will do something for God. In fact, the day we come to faith in Jesus we should begin to be involved. Don't waste years feeling inadequate. God wants to use you now.