@holbyfan it really depends on what you feel you would be happier with in the long run. Even if your parents want you to become a doctor, if you don't think it's right for you then become a writer if it is what you want because at the end of the day you should live your life for yourself, not for other people. I'm not too sure about the whole drama thing, I think it depends on the style of writing, so for things like a books you would probably just need the English degrees, but there may be some degrees that you could get in screenplay or writing for shows. There are other ways of getting good graces in drama, for example taking drama exams with registered drama classes but I'm not sure if you definetly need it.
Hope this helps slightly, and whatever you decide I'm sure it will be right for you. Btw I love your writing! x