Why do we still have a queen?

To all Canadians out there, why do we still have a queen? People say she's just a symbolic leader and that Britain doesn't have any power over Canada. But then the general Governor lets parliment parogue for 2 months? Wtf britain? Let canadians make decisions about Canada. Why do we let ourselves be considered a colony? How are we supposed to be taken seriously on the world stage if we bow to some appointed position from another country?