Ah
@Lily123 I do feel for you. I can (just about) remember how it was to be 16 and at odds with my parents. The truth is, parents come from a different age with different values (mine had spent their teenage years living through a war).
However I’m a great believer in “jaw-jaw not war-war” (you might have to look that one up!) and I second @Sally71’s idea of getting round a table, ideally with the consultant/nurse, to discuss all the implications - that way both you and your parents get the opportunity to put their concerns to a professional and get honest answers. I don’t think anyone could say that was a selfish or immature approach on your part.
Good wishes to you whatever you decide.