For all have sinned, and come short of the glory of God.
ALL; does not leave anyone out so we can safely say you and I do.
There are some very clear guidelines within the Old and New Testament. Laying out for mankind the benchmarks (base lines), which mankind should conduct their life by – they are absolutes from God, Boundaries set by God Almighty, to live outside of these is sin, then there is the personal instructions God may give to and individual whilst on the journey of life here on earth, to disregard these would be sin. I.e. missing the mark God has set for you as an individual.