This is one of those passages that makes it very clear that God is aware of literally everyone on earth. No one is outside God's notice. Take time to look at the "Weekly Connection" on this website this week. It will reveal a number of other passages in the Bible where it is made clear that God watches all of us.
This passage in Jeremiah is a quote from God Himself! He pays attention to everyone's life. And He can see in the darkest, most remote places on earth. Far too many people think they can merely ignore God and hope He will just go away! He says that such people don't even have "a hope" that that would happen! God will not be ignored, and if someone thinks that they're outside God's "radar" they will have a very abrupt reminder when they face Him in judgment! No one will be excused from meeting God after death.
The joy for the believer in Christ is that though God knows all their sin, He still welcomes them into His presence and forgives them! Thank God for your gracious Savior who covered all your sin and washed it all away!