If the steps you've taken as starting points indicate you should think further about professional church leadership, chaplaincy, pastoral counseling, or campus ministry, then here are some ways to explore the possibility that God is indeed calling you to one of these ministries.
High school student?
You will likely need to be in a college prepatory curriculum.
Enroll in courses that will give you a variety of perspectives. Try communications, social sciences, as well as Bible and religion.
Been out of college for a while?
Consider enrolling in adult education / continuing education opportunities.
Make use of study opportunities provided by your church. Teaching is also a good way to learn.