Read: Romans 7:1-6 and Psalm 145:8-14
St. Paul had to work hard to convince Jewish believers that the Mosaic law had been superceded by the new covenant. Instead of worrying about following the law, which was impossible to fully carry out, believers should follow the guidance of the Holy Spirit.
The thing is that we have to be open to the Holy Spirit. We have to be listening. Do you? Does God speak to you, or do you feel like you miss all the clues? Take some time to pray about this. Ask God to help you. Write your own prayer.