Have you looked at the entry requirements for Oxford? I'm not 100% sure but I remember a friend telling me she couldn't apply to do medicine at Oxford because she hadn't done maths but not all uni's require you to have done maths at A-Level.
And in the same way you just said Art makes you well rounded, use that to your advantage!
You've got decent GCSE's and excellent A-Level predictions, so in terms of academic requirements, you're all set. And no one is special or a genius, trust me. When it comes to medical students, everyone's super smart and got loads of As and A*s.
If you don't think you're cut out for it, maybe take a gap year and get a job in the hospital to see if you can cope.
Advice? Well, I'm only a fellow year 12 hopeful medic but ask any current medical students and doctors if they have any advice if you ever bump into one of them. Also, focus on your AS levels, apply to your strengths, get advice super good UKCAT/BMAT and lots of work experience and hopefully you'll get in.
Also, if you've had any personal experience with illness/ the NHS - include it if you're ok with it - it'll make you stand out
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