Shalom!
What matters is that you change to how God wants you to be, the person He wants you to become. You can say after this occurs that you believe you are in right standing with God and that you are the person God has made you to be, because He does not allow any of us to sin. He doesn't want us to. We will not get away with it. There is always guilt when we do. Unless there is something we do not see at the moment we sin. We may learn of what we have done wrong later. It is important to educate yourself about what God's word says. You can observe God's commandments as He wants you to do. This will come with time if you feel you are not there yet. It requires doing what God wants you to do. You can start with prayer and repentance. All have sinned, so if you have already repented in your life you may be okay unless you still need to repent. Some people believe that we should constantly repent our entire lives. Well, repenting is for what you have done wrong. So if you have not repented of wrong doing yet, even for specific sins, may God help you with that. We all need to do this if we have not done so already, and we may find that we still need to, whether because we sin or because we realize we have sinned.
Does scripture say that the believer does not sin?
Shalom.
Jacob