Your teachers have misled you.
Zechariah 12:10 says, “And I will pour upon the house of David, and upon the inhabitants of Jerusalem, the spirit of grace and of supplications: and they shall look upon me whom they have pierced, and they shall mourn for him, as one mourneth for his only son, and shall be in bitterness for him, as one that is in bitterness for his firstborn.”
John 19:30-37 says, “When Jesus therefore had received the vinegar, he said, It is finished: and he bowed his head, and gave up the ghost. The Jews therefore, because it was the preparation, that the bodies should not remain upon the cross on the sabbath day, (for that sabbath day was an high day,) besought Pilate that their legs might be broken, and that they might be taken away. Then came the soldiers, and brake the legs of the first, and of the other which was crucified with him. But when they came to Jesus, and saw that he was dead already, they brake not his legs: But one of the soldiers with a spear pierced his side, and forthwith came there out blood and water. And he that saw it bare record, and his record is true: and he knoweth that he saith true, that ye might believe. For these things were done, that the scripture should be fulfilled, A bone of him shall not be broken. And again another scripture saith, they shall look on him whom they pierced.”
This passage correlates with Zechariah 12:2-3, which says, “Behold, I will make Jerusalem a cup of trembling unto all the people round about, when they shall be in the siege both against Judah and against Jerusalem. And in that day will I make Jerusalem a burdensome stone for all people: all that burden themselves with it shall be cut in pieces, though all the people of the earth be gathered together against it.”
Jesus said in Matthew 23:37–39: “O Jerusalem, Jerusalem, thou that killest the prophets, and stonest them which are sent unto thee, how often would I have gathered thy children together, even as a hen gathereth her chickens under her wings, and ye would not! Behold, your house is left unto you desolate. For I say unto you, Ye shall not see me henceforth, till ye shall say, Blessed is he that cometh in the name of the Lord.”
Luke’s parallel passage, in Luke 21:20-24, records, “when ye (the disciples) shall see Jerusalem compassed with armies, then know that the desolation thereof is nigh. Then let them which are in Judaea flee to the mountains; and let them which are in the midst of it depart out; and let not them that are in the countries enter thereinto. For these be the days of vengeance, that all things which are written may be fulfilled. But woe unto them that are with child, and to them that give suck, in those days! For there shall be great distress (anagke) in the land, and wrath upon this people. And they shall fall by the edge of the sword, and shall be led away captive into all nations: and Jerusalem shall be trodden down of the Gentiles, until the times of the Gentiles be fulfilled.”
Zechariah 13:6 says, “And one shall say unto him, What are these wounds in thine hands? Then he shall answer, Those with which I was wounded in the house of my friends.”
John 19:5-7 records, “Then came Jesus forth, wearing the crown of thorns, and the purple robe. And Pilate saith unto them, Behold the man! When the chief priests therefore and officers saw him, they cried out, saying, Crucify him, crucify him. Pilate saith unto them, Take ye him, and crucify him: for I find no fault in him. The Jews answered him, We have a law, and by our law he ought to die, because he made himself the Son of God.”
John 1:10-11 says, “He was in the world, and the world was made by him, and the world knew him not. He came unto his own, and his own received him not.”
Acts 2:36 says, “Therefore let all the house of Israel know assuredly, that God hath made that same Jesus, whom ye have crucified, both Lord and Christ.”
Acts 4:10 states, “Be it known unto you all, and to all the people of Israel, that by the name of Jesus Christ of Nazareth, whom ye crucified, whom God raised from the dead, even by him doth this man stand here before you whole.”
Acts 3:26 records, “Unto you first God, having raised up his Son Jesus, sent him to bless you, in turning away every one of you from his iniquities.”
Zechariah 13, v7, states, “Awake, O sword, against my shepherd, and against the man that is my fellow, saith the LORD of hosts: smite the shepherd, and the sheep shall be scattered: and I will turn mine hand upon the little ones.”
Zechariah 14:5 predicts, “ye shall flee, like as ye fled from before the earthquake in the days of Uzziah king of Judah: and the LORD my God shall come, and all the saints with thee.”
I believe, we see a reference to the earthly ministry of Christ and particularly His final betrayal. Matthew 26:31 says, “Then saith Jesus unto them, All ye shall be offended because of me this night: for it is written (in Zechariah 13:7), I will smite the shepherd, and the sheep of the flock shall be scattered abroad.”
In Mark 14 we see an account of the arrest of Christ for crucifixion. Even those nearest and dearest to Him could not stand with Him at this dark hour. Verse 50 tells us: “And they all forsook him, and fled.”
Zechariah 14:4 says, “And his feet shall stand in that day upon the mount of Olives, which [is] before Jerusalem on the east, and the mount of Olives shall cleave in the midst thereof toward the east and toward the west, [and there shall be] a very great valley; and half of the mountain shall remove toward the north, and half of it toward the south.”
The prophets frequently intermixed literal and figurative language all the time. That makes it difficult to dissect. Even in the midst of the most literal of passages in the Bible, mountains are repeatedly used to impress deep spiritual truths. The predicted mountain moving ministry of John the Baptist is a case-in-point. The result of the cross saw the Gospel go out to both Jew and Gentile alike. The scope of the cross-work reached far-and-wide.
Luke 3:4-5 records, speaking of that great forerunner of Christ – John the Baptist, “As it is written in the book of the words of Esaias the prophet (in Isaiah 40:3-5), saying, The voice of one crying in the wilderness, Prepare ye the way of the Lord, make his paths straight. Every valley shall be filled, and every mountain and hill shall be brought low; and the crooked shall be made straight, and the rough ways shall be made smooth.”
John 4:10, 14: "Jesus answered and said unto her, If thou knewest the gift of God, and who it is that saith to thee, Give me to drink; thou wouldest have asked of him, and he would have given thee living water ... But whosoever drinketh of the water that I shall give him shall never thirst; but the water that I shall give him shall be in him a well of water springing up into everlasting life."
The living waters is the Holy Spirit. The former sea represents Old Testament Israel and the hinder sea represents the overwhelmingly Gentile New Testament Church. It figuratively represents the Gospel going out to the Jews and the Gentiles through the power of the Holy Spirit.