If you derive your idea of "right" and "wrong" from the fact that "everybody is doing it", then your are basing your thoughts, actions and life on the ever-changing, arbitrary, subjective bent of society ... But ideas that are arbitrary only have as much authority as someone decides to give them. If someone does not embrace that view of morality as authoritative, what standard can the others appeal to in order to tell them they are wrong? They have no basis but their own self-declared authority. Instead ground your own thoughts and actions in light of God's Word alone.
It it puzzling how those in society can be so certain that their morality is superior than others and are then morally outraged that you do not share their idea... why? If there is no objective morality then who is to say that ANY views are wrong?