We are almost to the Gospel (which means "good news"), but first we must understand where we are without Jesus so that what He did for you makes more sense.
The Bible says that Christ will be revealed from heaven with his angels:
2 Thessalonians 1:8,9
In flaming fire taking vengeance on them that know not God, and that obey not the gospel of our Lord Jesus Christ: Who shall be punished with everlasting destruction from the presence of the Lord, and from the glory of his power;
This judgment is the payment which you owe for your sin:
For the wages of sin is death;
We all know that wages are something we earn. By our sin, we have earned death. This isn't speaking of just physical death. We read in another verse exactly what death this is:
And death and hell were cast into the lake of fire. This is the second death. And whosoever was not found written in the book of life was cast into the lake of fire.
So you might be asking, "If everyone is a sinner, and sin is deserving of death, how does anyone get to heaven?"
I'm glad you asked that! On to the good news!