What's wrong with people?

There are times when I feel that everyone around me is mental. Since marriage, such occassions have exponentially increased. I fail to understand the stupid norms of the Indian society. Why does a girl need to adjust, compromise and even apologise for every little thing?
We are supposed to cook for the entire clan, keep the house clean, go to work, look pretty all the time, keep smiling no matter hom tired you are, never crib or complain and the list goes on. The expectations from a newly-wed girl are huge, not just from her in-laws, but from neighbours, relatives and friends. Everyone thinks its their birthright to load you with advice and suggestions on how to manage your husband and your house. What I don't understand is if our parents think that we are mature enough to get married, then why don't they let us use our brains and stop spoon feeding all the time. I don't want people to tell me how to sit, how to talk, when to smile, when not. Most of all, why do people think they are allowed to pester a couple on starting a family. Its such a personal thing between the couple, how can people intrude. Will people ever get on with their lives and stop interfering? Will we never stop taking decisions for our children? Will people manage their expectations and do not pressurise the newly-weds?