All have sinned against God and fallen short of His standard. (Romans 3:23) We do not and cannot earn salvation by keeping the Old Testament Law or by simply being a good person. We will fail every time; it is in our nature to sin. It is only through God sacrificing His Son Jesus in our place, that we can acquire complete forgiveness. We can all attain this by accepting Jesus as our Saviour, and accepting that He shed His blood to atone for the sins of all who repent.
Regardless of what sins we have committed against God, He offers this gift to each of us. John 3:17 tells us that Jesus didn’t come to condemn us but to save us.