According to the Bible, and to God (whom I try not to argue with very much), I am a sinner. The fact is that you are a sinner, your best friends are sinners, so is Billy Graham and the Pope. I am, just like every human ever born, except One, I am a carnal lust filled animal, who like the family dog, am physically attracted to my animalistic urges. I like looking at pretty girls, and I am 62 years old. I probably will continue this for a long time. I understand fully well that without the help of God Almighty, I am just an animal in the body of a God-Like human trying to survive on instincts. It is the living God that dwells inside of me that makes me different than an actual 'animal'. I unlike most on this earth today know this fact, and I am grateful for that knowledge.
Sin is the breaking of God's Law. That is the definition given in every Bible ever printed. It reads in 1 John 3:4 "Everyone who commits sin also breaks the law; sin is the breaking of the Law."