Right and Wrong

How do you really decide right from wrong? Ive been noticing lately that people have been pushing me to doubt what I have learned. I mean like my mom and teachers have been saying to 2nd guess things, like things that we are shown in the media or taught. But its making me think about everything. Like how can you tell right from wrong? Things that seemed so simlpe arent. And things that are complicated just get more complicated. Its so confusing!