Single is a legitimate state in life but it’s not a vocation.
You are the one limiting the word “vocation” and its definition and meaning. The Church has mentioned the word “vocation” many times, and has not limited it to an association with marriage or religious or “consecrated singleness”.
The CCC has this to say about “vocation”:
1877 **The vocation of humanity is to show forth the image of God and to be transformed into the image of the Father’s only Son. This vocation takes a personal form since each of us is called to enter into the divine beatitude; it also concerns the human community as a whole.**1998 This vocation to eternal life is supernatural
44 Man is by nature and vocation a religious being
898 “
By reason of their special vocation it belongs to the laity to seek the kingdom of God by engaging in temporal affairs and directing them according to God’s will. . . . It pertains to them in a special way so to illuminate and order all temporal things with which they are closely associated that these may always be effected and grow according to Christ and maybe to the glory of the Creator and Redeemer.”
2392 “Love is the fundamental and innate
vocation of every human being” (FC 11).
1699 **Life in the Holy Spirit fulfills the vocation of man **(chapter one). This life is made up of divine charity and human solidarity (chapter two). It is graciously offered as salvation (chapter three).
1886
Society is essential to the fulfillment of the human vocation. To attain this aim, respect must be accorded to the just hierarchy of values, which “subordinates physical and instinctual dimensions to interior and spiritual ones:”
1533 Baptism, Confirmation, and Eucharist are sacraments of Christian initiation. They ground **the common vocation of all Christ’s disciples, a vocation to holiness **and to the mission of evangelizing the world
2232 …
the first vocation of the Christian is to follow Jesus:
2021
Grace is the help God gives us to respond to our vocation of becoming his adopted sons.
1604 God who created man out of love also calls him to love
the fundamental and innate vocation of every human being.
1717 The
Beatitudes depict the **countenance of Jesus Christ and portray his charity. **They express the vocation of the faithful
1719 The Beatitudes reveal the goal of human existence, the ultimate end of human acts: God calls us to his own beatitude. **This vocation is addressed to each individual personally, **but also to the Church as a whole, the new people made up of those who have accepted the promise and live from it in faith.
2442 It is not the role of the Pastors of the Church to intervene directly in the political structuring and organization of social life. **This task is part of the vocation of the lay faithful, **acting on their own initiative with their fellow citizens. Social action can assume various concrete forms. It should always have the common good in view and be in conformity with the message of the Gospel and the teaching of the Church. It is the role of the laity "to animate temporal realities with Christian commitment, by which they show that they are witnesses and agents of peace and justice
1546 Christ, high priest and unique mediator, has made of the Church “a kingdom, priests for his God and Father.” The whole community of believers is, as such, priestly. The faithful exercise their baptismal priesthood through their participation,
each according to his own vocation, in Christ’s mission as priest, prophet, and king. Through the sacraments of Baptism and Confirmation the faithful are “consecrated to be . . . a holy priesthood.”
863 The whole Church is apostolic, in that she remains, through the successors of St. Peter and the other apostles, in communion of faith and life with her origin: and in that she is “sent out” into the whole world. All members of the Church share in this mission, though in various ways.** “The Christian vocation is, of its nature, a vocation to the apostolate as well.” **Indeed, we call an apostolate “every activity of the Mystical Body” that aims “to spread the Kingdom of Christ over all the earth.”
1879 The human person needs to live in society. Society is not for him an extraneous addition but a requirement of his nature.
Through the exchange with others, mutual service and dialogue with his brethren, man develops his potential; he thus responds to his vocation.
826 Charity is the soul of the holiness to which all are called: it “governs, shapes, and perfects all the means of sanctification.”
If the Church was a body composed of different members, it couldn’t lack the noblest of all; it must have a Heart, and a Heart BURNING WITH LOVE. And I realized that this love alone was the true motive force which enabled the other members of the Church to act; if it ceased to function, the Apostles would forget to preach the gospel, the Martyrs would refuse to shed their blood. **LOVE, IN FACT, IS THE VOCATION WHICH INCLUDES ALL OTHERS; IT’S A UNIVERSE OF ITS OWN, COMPRISING ALL TIME AND SPACE - IT’S ETERNAL! **