In the first four chapters in Romans, we have seen Paul demolish all ideas that we can earn our way to heaven with good deeds.  Our righteousness is not deserved, because we are all sinners (Romans 3:23).  But through Christ’s sacrifice, His righteousness is credited to all those who believe in Him.  It is a remarkable act of grace on God's part because we are all so very unworthy (1 Peter 3:18).  

And so many benefits come to us (2 Corinthians 9:8): justification, peace, access to God, joy and hope.  Firstly, to be 'justified' is (using an English pun) to be treated by God 'just as if I'd’ never sinned.  It does not mean that we are perfect, but that all of the blame for our sins has been taken by Jesus, and so we are declared ‘not guilty’.  Secondly, peace is not primarily a feeling of calm (although that is a by-product); it is like the signed agreement at the end of a war promising that hostilities have ceased - therefore we are no longer under God's wrath (John 3:18).

Thirdly, access to God, which was previously impossible for sinners, has now been opened wide.  When we receive Christ we have an intimate relationship with our Creator now, and will have the joyful fullness of His presence in the life to come (Jude 1:24).  Fourthly, with these blessings comes a deep joy and an inner confidence ('hope') that when Jesus returns we will be accepted by Him and welcomed into His heavenly home (Romans 8:18-25).

So you see, it is not only futile to boast about our achievements before God, but His grace gives to us infinitely more than we could ever have dreamed about (Ephesians 3:20).  As that is true, where is our joy and hope?  Why does worry dominate?  If joy and hope are missing, it is because we have not understood that believers have peace with God because of what Jesus has done.  To be justified is to be declared 'not guilty'.  So, once again, give over the burden of your sin to Him and let Him make you at home in His presence (Psalm 16:11), and allow Him to make His home in you (John 14:23).  When that happens, you will be different (2 Corinthians 5:17) - and the difference will be appreciated by everybody around you at work and at home.