graduate medicine seems even more impossible - coz den ur competing with other hardcore determined med student wannabees :S
But you're already competing against other students who want to do undergraduate medicine - how does it seem even more impossible or any different for that matter if you're truly determined to go for medicine and give it your best shot at it?
And also, keep in mind that there are plenty more places and options once you're in grad med. It's so much more flexible. You can always do your preferred degree next year and apply for non-standard entry into the same courses next year.
My friend did not score high enough on the UMAT for medicine in year 12. He ended up getting into pharmacy, and tried for the UMAT again in first year uni. It took him a whole three tries before he got high enough for an interview but he was over the moon once he got in. If he failed again, he'd have a chance at grad med the year after or he'd have a career in pharmacy ready to go. It was a win-win-win so to speak
Point is, this is only a small hurdle in the path to becoming a doctor, it is by no means the end, not even close. You can pretty much try out for medicine every year after this one.
Think about it in this perspective, remember all those 40 year olds at the UMAT test centre? they're in your exact position now except you've got a twenty year headstart. This one measly year is nothing in the grand scheme of things