When you receive Jesus as your Lord and Savior you have peace with God. Being justified means being made righteous! That's something to get excited about! It's not in what you did it's by His grace. Rest in knowing that you can have peace and be made righteous with God through His son Jesus.
If you've never received Jesus it's a simple prayer.
Dear Lord Jesus come into my life. Forgive me of my sin. Set me free Jesus. Thank you that you died for me. I believe that God raised You from the dead. Fill me with the Holy Spirt, the peace of Gospel and the joy of the Lord. Thank you that I am saved and on my way to heaven in Jesus name.