Dear friend, we will all certainly be praying for you; a vocation to religious life is a great blessing and a great responsibility indeed! Deo gratias!
I suggest that along with prayer, especially before Our Lord in the Blessed Sacrament (if possible where you live), that you begin meeting with a traditional priest for formation and examination of your heart, mind and conscience as soon as possible. Even if, actually ESPECIALLY if, you think this might just be a 'vague feeling' or passing idea, you should submit yourself to the experience and spiritual authority of a validly-ordained traditional priest; in this way, he will be able to direct your devotional life in terms of which devotional practices would be beneficial. He will also be able to suggest good reading material and will be able to determine how your life so far has begun to conform to the habits and tendencies of one who is called to shepherd and teach others.
Please remember that while vocation, whether to the priesthood, to monastic life or any other calling, is a SERIOUS business, your heart and mind should never be totally devoid of joy and excitement as you think about the religious life. Remember that St. James and St. John, the sons of Zebedee, immediately left their father's fishing business to follow Our Lord Jesus when He called them. Likewise, St. Matthew took up Our Lord's command to follow Him in an instant.
While there will certainly be challenges to your determination (the Scriptures tell us that the world, the flesh and the Devil are constantly at war with our souls), there should also ALWAYS be a gladness of heart. As you anticipate giving yourself wholly and completely to the worship and adoration of Our Lord, commit yourself to not only the protection which Our Lady offers, but also commit yourself to protecting HER, both Her dignity and place as Mother of Our Savior, and her dignity as She is representative of Holy Mother Church.
Again, be completely assured of my prayers for you; I believe I speak for nearly everyone on this forum when I say God bless you richly with every grace as you seek His will for your life.
St. John Vianney, pray for us and for this young person, that traditional, faithful vocations might increase to the glory of Our Lord and the honor of Our Lady.
O Mary, conceived without sin, pray for us who have recourse to Thee.
Sacred Heart of Jesus, have mercy on us.