You are called!!!

For the perfecting of the saints, for the work of the ministry, for the edifying of the body of Christ. (Ephesians 4:12)

Ministry means service. To minister is to serve.

How does God "serve us"? God serves us by helping us. So, primarily, ministry means helping people. Of course, the foremost way of helping people is to help them know God and His Word, so they can receive all
God has provided for them. But anything that helps people -- that makes their life easier, or better -- is also ministry. That is, it is part of the ministry of God: God's purpose, God's plan, God's desire for humanity.
God desires the best for all people. People were God's idea, and He longs to bless them. God helps people. So, when you help someone, even in the smallest way, you are acting like God.
Therefore be imitators of God, as beloved children; and walk in love, just as Christ also loved you, and gave
Himself up for us, an offering and a sacrifice to God as a fragrant aroma.

We are to imitate our Father God -- or act like Him. How? By walking in love, just as Christ did. In practical terms, what is walking in love? Helping people. Walking in love means you will help people, you will put their interests first. Whether your involved with homeless ministry or praying for those in need, or assisting with clean up at the church or working in children ministry you do the Will of God. Being apart of ministry does require that you have a degree or a license but  simply a desire to glorify God and show the love of God to those that are in need.  If that is what you desire to do, then you are apart of ministry.