Isaiah 42:1 "Behold, My Servant, whom I uphold; My CHOSEN ONE in whom my souls delights. I have put My Spirit upon Him; He will bring forth justice to the nations."
No one is chosen or elect unless they are in Christ, who is Himself the Chosen One. Once in Christ, you have become part of the Chosen People, the Elect, the Body of Christ. In God's sovereignty, He has decided that all those who freely choose to put their faith in Jesus, will share in His "chosenness" and in His "election".
The body of Christ, from eternity past (called the remnant of Israel and the chosen in the Old Covenant), was always going to heaven. The only question has always been, will you freely choose to join them?
Deuteronomy 7:6 "For you are a holy people to the Lord your God; the Lord your God has chosen you to be a people for His own possession out of all the peoples who are on the face of the earth."
Even though the Israelites were chosen by God, not all of them remained true to God, only the remnant of Israel was saved. Paul makes that very clear when he quotes Isaiah in Romans 9:27:
"Isaiah cries out concerning Israel, 'Though the number of the sons of Israel be like the sand of the sea, it is the remnant that will be saved;' "
The same is true today, even though all men are called, only those who repent and put their faith in Jesus will be saved.
"And I, if I am lifted up from the earth, will draw all men to Myself." John 12:32
However, even as many Israelites, who were chosen, did not remain faithful, and thus were lost, it is also true today. God does not force anyone to remain with Him. We will always have the free will to remain or to leave. Again, the Body of Christ will go to heaven, but will we remain in that body, or choose to leave? The choice is ours.