Its clear you haven't done enough research yourself yet on what you want to do, if you just 'want to become a doctor'. Look around on UCAS for courses linked to medicine but not medicine itself as you need chemistry to study it (anyone telling you otherwise is lifting your hopes for no reason as you will be disappointed because medicine is a highly competitive subject). Look at courses like biomedical science, microbiology, medical biology, biomedical health etc. These will not give you a direct path into your preferred profession, but with enough career guidance though university and the future you should be able to find yourself in a similar field of work.