Hi Josh!
If you've asked forgiveness, and still feel like you are sinful, ashamed, unforgiven, then you need to learn more about what God has done for you. Remember, His throne is a throne of GRACE. He welcomes us, bids us to come to Him. In Hebrews, it says to come BOLDLY to the throne of grace to obtain mercy and grace in a time of need. Remember, He put YOUR sins on Christ. And when you accepted Him into your life, He put His own RIGHTEOUSNESS upon you... I call it the Great Exchange! So when you feel ashamed because the unseen enemy harrasses you about your past, remember that the LORD looks upon His Son's sacrifice much more than He does your blemishes and sins. As long as you have confessed your sins to God, you are forgiven, AND CLEANSED. In other words, no more baggage! Let the Holy SPirit take those burdens from you, Josh!
Now... Regarding your past sins. Perhaps your conscience is saying, "Return to the ones you stole, what you stole." Perhaps you are able to pay back in full what you took. If you decide to do this, it will be a powerful act on your behalf. In fact, it may be the greatest acts you've ever done! Why? Because when you confess and ask forgiveness, and try to repay back or replace what was stolen, those people will immediately see a testimony of GOD's power in your life. You will be a witness of His power to change the human heart!
So do what you can. But live free. You shouldnt be weighed down by the past... Write me directly if you need more help or have any more questions!
~Sean