Hey miss_ash_mash!
Bit of a dilemma you have there, but you’re not alone. I was pretty unsure of what I wanted to study after high school and my preferences ranged from science to architecture to arts (humanities). It’s absolutely OK to not know what you want, especially if you’re young. Heck, loads of people still don’t know what they want and they’ll be finished high school or uni! It’s a lot harder when expectations and familial pressure, however unintentional or intentional, get mixed in, but you’ll be the one doing your future degree and you might as well be satisfied with it.
My suggestion is to try some different activities in your spare time. They don’t have to be time-consuming or consistent. Trying small things (e.g. drawing) and researching something of interest online doesn’t take much time and can be a good way to start skimming to see if anything is to your liking beyond what you already know.
Another suggestion is if you’re in Year 10 or younger, try to take classes or perhaps join clubs/ extracurricular activities that are a little out of your comfort zone. If you’re in Year 11/12, you can try to read about something else that piques your interest or watch YouTube videos about an area besides those you're used to. Watching Netflix shows also might help. My point is: try to take little steps and try a little of everything until you hit some gold, using your spare time. I think experiencing something for yourself will help you convince yourself of what you'd rather be doing, whether that be med or not. Initially, medicine will feel like the only comfortable option for the future, but the more you venture out into the unknown, the more you’ll be able to make a more informed decision.
Moreover, ask if you’re able to shadow one of your relatives at work or do some work experience in a medicine-oriented area (especially since it’s the holidays right now). Doing so might help you realise if you’re cut out for a medicine career or if it’s not for you. It might also help refine which discipline you'd be most interested in or aspects you like/ dislike.
I also agree with the responses above: checking out other courses, going to events and talking to other people in various courses might help to expand your options for future courses. You can also PM anyone you find interesting here on AN (ATARNotes) and ask them about their own courses and check out our uni journals, if you like.
Postgrad med (i.e. studying med after another degree) and studying med interstate (whether it be undergrad or postgrad) might also be possible options, letting you have that extra bit of freedom and/or independence, if that's what you're after.