Repentance has as it's short definition, "A change of mind". When the lost, prodigal son in Luke 15 "came to himself" while serving a foreigner in the hog pen, he then said, "I will arise and go to my father..." that was repentance. Repentance is a necessary work that continues life long while there is any sin in the experience to expel, so the prodigal son's repentance was only repentance begun, yet it was still true repentance. Because he had a change of mind about where he was and what he was doing, he then also in logical sequence had a change of committal about whom he would serve. Repentance is a change of mind or heart, which change of mind produces a change of action. He who thinks that repentance is simply abstaining from "this" or "that" sins merely out of force of guilty conscience alone, has missed the very heart of true repentance. When a sinner is given or allowed of God a new mind about what is true, and/or a new desire of the heart about what is right, this "change of mind" must invariably by degrees also produce a change of action in harmony with that new and godly mind or heart.
We don't read anywhere in chapter 15 of the lost son weeping away tears of sorrow upon the corn husks that he was forbidden to eat, in fact, his very initial motive in returning to his father was basically one of self-interest. "...How many of my father's hired servants have bread enough and to spare, and I perish with hunger!" vs 17b. Still, he did have a change of mind and that change of mind produced a change of action and that was repentance begun. One may weep in sorrow under the conviction of the Holy Spirit and be the object of a very deep work of repentance towards God, and yet again, one may also weep as Esau did over the loss of his birthright, and never truly come to a lasting and genuine relationship with the Lord simply out of lack of a new mind or heart. If you have been given a change of mind or heart that is accordance with the will of God...A new direction that you seek to travel in that has this gracious Being as it's sole destination, then never fear about whether or not you have biblical repentance because you do. This "change of mind" or heart must of necessity begin you out in a new and godly direction which will demand new and godly actions, thoughts, words and motives, and that will be repentance as far as God is concerned even though you shed never a single tear. When the joy and peace of God the Holy Spirit fills you to the brim with unspeakable gratitude down the road somewhere as He leads you on to glory, there will be plenty of time for tears then and there.