Parable of the Good Shepherd
"Which of you men, if you had one hundred sheep, and lost one of them, wouldn't leave the ninety-nine in the wilderness, and go after the one that was lost, until he found it? When he has found it, he carries it on his shoulders, rejoicing. When he comes home, he calls together his friends, his family and his neighbors, saying to them, 'Rejoice with me, for I have found my sheep which was lost!' I tell you that even so there will be more joy in heaven over one sinner who repents, than over ninety-nine righteous people who need no repentance." - Jesus Christ
— Luke 15:3-7
This illustrates the depths of God's love so beautifully. The Lord is telling you here that when you repent, as a sinner, there is a rejoicing, a celebrating that you've returned to Him. Do you remember ever waiting for something, such as a call for a job or waiting for a person to return home, and after a time of stress and worry, you received the good news that your waiting was over? Do you remember how the relief washed over you followed by complete joy that you couldn't contain? This is how the Lord sees you! You are His treasure that he wants found and returned to Him. Go and be in peace to know that you are loved.