People are taught how to live their lives by their parents. The good habits and bad habits all seem to be passed down through family lines. I'm sure some of it is genetic, but most is how you treat and educate your children. They are born without preconceived notions of how things should be.
First comes family pressure to become someone or something that carries on the family traditions. Most parents expect their children to be little carbon copies. They want children that are miniatures of themselves.
Then comes peer pressure. The world expects some sort of "normalcy" or status quo. Many people just can't or don't want to live up to "standards" put upon them.
When we can't follow our own nature and our own common sense for whatever reason, we feel stifled and restricted. Life seems to be a prison.
People are also born with an innate sense of "herd mentality". They want to be like others. They want to follow the leaders. It is very rare to want to be a leader. Breaking with tradition is every bit as hard as breaking out of "prison".