it depends what grade your in ,I know that in grammar school and middle school you do not get to choose your subjects ,but once you get to high school ,you are given some freedom in choosing your main subject ,choose it wise, remember that is your future which you are investing in ,the more knowledgeable that you are ,the better chance you have at getting a better paying job .
as long as you think you are a "dumb girl" you will be. too many people on this planet hide behind the dumb or too poor or no education shields. that allows them to be lazy and eventually no body expects anything from them. soon they expect less and less from themselves and lose control of their experience in life. then if "good" things happen to them they give credit to others. when "bad" things happen they blame others. it's simply a matter of assuming personal responsibility. what are you interested in? be unafraid of making mistakes. that's how humans learn and grow. pursue it and take your chances on the outcome. that also requires courage and ever expanding self worth. but in whatever direction a person goes, they will get resistance from others. some will support your decisions, some will dis you horribly. but if you follow through and succeed, they can all go take a long walk off a short pier. and if you get good enough at whatever you have chosen to do, then you can help others do the same in their field. how come your parents and/ or teachers aren't telling you this?