Ethics Undefined

Ethics is such a hard word to comprehend. I mean, sure, there are various definitions to it but every person has their own set of ethics and with these don't we have our own definition within ourselves because all of us were brought up differently, have different experiences,religions,principles, goals and dreams? If that's the case for you readers, does this mean we also have a different set of media ethics when we go and find ourselves in the shoes of a media practitioner? If so, how do we remedy this? If we can't are we being unethical or are we just doing our job? Is the law the only thing defining our ethics if we are all different?