There are many opportunities for all members of the Body of Christ to serve God in the Church:
If a person feels called to be a lay missionary, he/she serves for a period of time, either for months or sometimes years. Usually, this involves finding an organization to be associated with as a lay missionary, and choosing to do some type of work that would benefit those to be served. The choice can be made to serve in one's home country, or to be a foreign missionary. This call to do lay missionary work can be made by a single person or by a married couple. When the time of agreed- upon service is ended, the lay missionary can decide to fulfill his baptismal call in another way, or he/she can remain a lay missionary for the rest of his/her life.
If a person feels called to religious life, this involves finding a religious community to become associated with, so as to discern whether one is called to the religious life and to this specific community. The essential difference between a lay missionary and a religious is that a person who is called to be a religious makes the three vows of chastity, poverty, and obedience after the initial time of formation is completed.
There are many different types of religious communities. Some are more active in such ministries as education, health care, social services, pastoral care, evangelization, giving retreats, and so on. Some are more contemplative (prayer focused) and live apart. The lay missionary does not make the public vows of chastity, poverty, and obedience, since a married couple could be lay missionaries, and although being a lay missionary would most likely entail a simple and poor lifestyle, that is not the same as making a vow of poverty in a religious community. Nor is obeying the leader of a lay mission association the same as making a vow of obedience to a religious superior.
If a young man chooses to be a priest, this involves choosing between being a diocesan priest, in obedience to a diocesan Bishop, or being a religious priest in a religious order for men. A religious priest is both a member of a religious order and an ordained priest, and so this calling involves balancing these two aspects. A young man aspiring to be a diocesan priest can talk to the director of vocations in his home diocese for help in discerning his vocation and which seminary to attend. A young man aspiring to be a religious priest would choose a religious order to help him discern this call.
In desiring to discern where the Lord is leading you, it is essential that you spend time in prayer to seek the Lord's will for you and then to experience something of the choices available to you by getting to know people in these vocations and seeing yourself. Possibly you could spend some time in service with them to get a closer look at their way of life. This will help you discern if your gifts, talents, and personality are suited to these vocations.