You need to fit in, somewhat, to live in harmony with society. This is true. Even those that are anti-social will form groups, of which there will be rules that govern who is part of the group and what constitutes acceptable bahaviour. I believe all societal systems run this way. It is part of who we are.
This is not to say that conformity is a bad thing. Without conformity there would be no way to drive down the street and not get hit by a car. Drivers, pedestrians and other users of the road need to conform to the road usage system, namely the Highway Traffic Act. We have laws that govern these things. Those that scofflaw the rules can hurt other people and get punished for their behaviour. In the name of safety this is good.