As much as I'd like to advise you to just pick the thing you enjoy, honestly, although that is a major factor in subject choice, it isn't as simple as that and shouldn't only be based on that.
I know it's early days still, and it's very difficult to have an idea of where you're headed in life, but you have to consider how your subject choice now will affect your subject choice come AS Level. Not only should you consider how not taking a subject at GCSE may prevent you from taking it at AS Level, but bear in mind that just because you like a subject or subject area now, doesn't necessarily mean that you'll like it in 2 years time. And heed your parents advice!
For example: I hated maths when I was your age. It was my worst subject (although admittedly still decent, low A). But my parents pretty much forced me to do further maths GCSE, and I hated them for it at the time, but now I'm taking Maths and Further Maths AS Level, hope to continue both to A level, and aspire to do Mathematics at university (possibly Oxford). A lot can change in 2 years.
I'd probably take your parents advice in doing a subject outside of the creative arts - Idk if you have any experience with compsci at all or if you think you'd like it, so many you'd want to consider a different subject who knows, but your parents are right in that it's a good backup plan as compsci is becoming/already is a major thing.