You could carry on, but do something like Biochem at uni. Then after completing that, you could apply for Medicine, but graduate entry?
Of course your other choice would be to resit.
May I ask for your GCSEs? And you said you should have got As... Do you mean that you was predicted 4 As by your teachers?
Don't think that your doors to Medicine are all closed. Work hard and you will hopefully achieve what you want :-)