Why shouldnt I pay attention to what people say?

People usually put a strong influence on us that leads us to do what they think is "right". In your view, what are de positive aspects of paying attention to them and what are the negativities about allowing them to rule our lives. I normally feel pushed to do things I consider to be worldly accepted, like, if I have a gf I should marry her first before moving in together. Or put a mask so they see that you are living a decent life, having a car and living in a nice neighborhood.