"The joy of the Lord is my strength" Nehemiah 8:10
God's joy transcends suffering and pain, and also earthly happiness. It is what we get when we study the Word of God, pray, meditate on the Word, and obey God. It is the joy we get from following God's way, not the world's.
The knowledge that Jesus came to save us from sin and death, also gives joy! The gospel is always a source of joy! Do you know Jesus? Has he saved you? Are you reading the Bible daily? God will lead and guide you from the pages of the Bible, which is also joy!
If you have other questions, I will pm you. Let me know here, first. And remember God loves you, and sent his only Son to the cross, to redeem us from our sins, and our sin nature. And he rose from the dead, and is coming again soon! Hallelujah!