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.
In science we have the chaos theory, where inequalities dissipate and even themselves out. We call this equilibrium. Hot air blends with cold, resulting in both coming to the middle. You really need to work hard to break from the laws of nature.
And yet it is the breakthrough events that violently change our lives. The unexpected hurricane, flood or fire. These are bring destruction and then eventual renewal. This chaos is unwelcome but it is certainly a big part of life.
But back to society at hand. We have conformity because we like conformity. You can get a lot more done when everyone is following the rules, and is certainly safer. It also suppresses new ideas and revolutionary change. I guess this is the idea.
“The nail that sticks up gets hammered down” is certainly true, but that nail might provoke the idea that instead of using nails you should have used screws?
Welcome to the education machine