It's not all about the grades tbh, take it from me, I managed to get in with A*AB, so nothing special.
The thing about medicine is that most applicants apply with AAA+, so what medical schools do is differentiate between all these people who have the grades, and see which applicant is most 'suited' to becoming a doctor. The thing that you have to make sure you do is make yourself stand out - doesn't mean you need to do something amazing, but at least have some quality about you that will make you 'better suited' than the next applicant.
Also, and I can't stress this enough, APPLY TO YOUR STRENGTHS. If you have an amazing UKCAT score, apply to a uni like Kings, or if you're doing BMAT and have a good score, go for UCL. No point in applying to Bristol that doesn't even look at UKCAT or BMAT. So go through each uni and be really harsh on yourself - who would chose you out of a pile of applicants that might have better grades than you/more experience blah blah blah?
If you want it bad enough, you'll get in, I promise that. Good luck!