I don't know much about this, though there was a good thread recently you could search for. Consensus seems to be that's it's easier to qualify here and then do the USMLE to allow you to practice in America, than it is to apply to medical school there. Easier, but not easy. Also a lot cheaper.
I also recommend you take a gap year and reapply to medicine in the UK next year. You don't want unnecessary student debt for a course you're not interested in, plus grad medicine is harder to get into.