why?

being in the crossroads in not as exiting as it sounds… brings more headache actually.. i am brought up to pursue my dreams.. but why when im a grown up i am not given the choice to follow what i want?? why? why is there ever a double headed snake exist? at a certain time she will say ok ok.. do what ever u wantits ur life.. and all of a sudden she will turn back and say.. im so hard headed and dont want to follow eldery’s advice and stuffs like that.. why? haiz.. why cant they support my decision ? why??