Why is it so complicated to take a next step when you are bound with family value system?

In my point of view, its just the way we are brought up. We tends to look back often than what lies ahead of us. Especially coming from conservative and strong cultural background, we always think about others more often than ourselves. For example, if we want to do something, first thing that comes to mind is what will other think about it or how they will perceive it. We care more about family values, prestige, cultural, background, etc. Why it is hard to follow own will and just not to think about others. Even we know we can do it, but still there is a instinct that does not allow us to do. In some cases, I appreciate what we are doing does not affect anything and It brings happiness in the family...but still there are certain things that just keep us back...in doing things that are fun sometimes....like hangingout with friends, wearing fancy clothes, having different views about things...overall more open minded...I tell people that im open minded but somewhat i feel like im not in certain thing...LOL