A basic universal human nature is the need to belong. We belong to a family, an ethinc group or race, a territory (or history of where we came from), familiar with a culture and religion, and so on. Above all, the Bible says that the human heart yearns for that which is eternal ( Eccles. 3:11) --- because of it, many religions have been formed to fill the need or vacuum in the heart. To satisfy this yearning of the heart, the spirit within must connect with the Spirit of the true God, for God is Spirit (Genesis 1:2; John 4:24).
For those who are truly born of the Spirit (John 3:6), taking time to fellowship with God in worship, meditation and prayer are (should be) the norm of one's daily life. Sometimes we indulge too much in the flesh or mundane activities of the world and lose our sense of peace and feeling of belonging to God. As God weans us from worldly frivolities and woos us to Himself, we should find ourself becoming more like the one who called us. "He who called you is holy", declared the apostle Peter, and that we ought to be holy (1 Peter 1:14-15). This is it: you are called to be holy!
You may feel hesitant or unsure about many other callings, but this call to holiness is as clear as the sun. Jesus died on the cross so all our dirt can be cleansed (1 John 1:5-7), and how dare a Christian can think he/she can keep Christ in the pocket and go out to the world and fool around. If you think this way, then you are in self-deception. Snap out of it! "Holy, holy, holy, is the Lord God Almighty" (Revelation 4:8).