Sin can be an omission or a commission.
When you fail to do what you imagine the ideal human would do in your place, you are committing a sin of omission. When you do something other than what you imagine the ideal human would do in your place, you are committing a sin of commission.
When you fail to do what you imagine God would do in your place, you are committing a sin of omission. When you do something other than what you imagine God would do in your place, you are committing a sin of commission.