Ministry is any endevour that postively meets the Spiritual or Physical needs of people, it does not neccesarily have to be a church/parachurch organisation. the first minister in the world(Adam) was not a pastor, He was a Caretaker of a Garden!
God has serval means through which He wants to bless the world, in areas like, music,agriculture,technology,building&construction to list a few.
Be and do your best in the field that God as placed you as an able Minister.
You will Flourish!