Communicate regularly with God and ask Him what He desires for you. It’s particularly important to have a Marian devotion, such as the Rosary. Ask the Blessed Mother to lead you to her Son so that you can accomplish Christ’s will for your life.
Keep your soul nurtured with God’s grace through the sacraments of Confession and the Holy Eucharist.
It is impossible to discover your vocation without good information. What does it mean to have a holy Christian marriage? What do priests do? What is it like to be a religious sister or brother? Find good information, then take what you have learned back to prayer.
What are my interests and desires? How can my gifts be used to serve God’s people?
What abilities do others see in me? Am I only seeking immediate happiness for my life?
What abilities do others see in you? What are the needs of the Church? Are you only seeking your happiness or are you also considering the needs of those around you?
Don’t try to discern your vocation alone, without the help of the Church. Talk to a sister, priest, or deacon you trust.