No one knows or understands everything about the end. What is known is that there will be a day that God's family will be sifted. His people will permanently be separated from those who are not His. There will be a day that each person stands before Him to account for the time He gave in life.
One day you will face God sitting on His throne and give an account for your faith, all hidden secrets, and opportunities. If you are not a Christians, then your fate has already been decided. You will face your second death to spend eternity in torment with Satan. If you are a Christian, then you will be judged according to your works.
Christians judgment may be uncomfortable, but you are a part of God's family. You will still enter Heaven to live in eternal peace. Your judgment is based on faith. You will not face God's judgment like unbelievers. It will reveal your good works and the trails and tribulations you endured to follow Jesus. If you endure the fires of purifying faith now, then you will never see them in judgment.
Your judgment day will go according to how you live your life. You are making that decision today. It doesn't have to go badly, but you do have to choose a little discomfort now to avoid a lot in the future. You have to have an eternal mindset to see beyond your today. Don't be motivated by fear, but instead love. Final judgment judges the heart and mind and faith, not actual deeds. Your works are a biproduct of your faith.
Sin matters. Sin will not be entering Heaven. Sin is the root of everything that divides you from God. It empowers Satan giving him small victories that will not give him any real foot hold but makes him believe he has more power than he does. Do not give him power in your life. Repent for any sin and turn away from your habitual sin to honor God while you are alive. God doesn't need you for power.
God chooses you. He is not using you. Satan is the one that uses people. God give s you purpose and allows you to have a part in the bigger picture. Satan wants to destroy you and relish in your pain. Eternity is a long time. Try not to get distracted. Focus on what really matters.
Matthew 25:31-46, Luke 16:19-31, Acts 17:30-31, Romans 8:1-4, 1 Corinthians 3:12-17, 2 Corinthians 5:6-10, Hebrews 9:27-28, & Revelations 20:11-15