If you do obtain the predicted grades you mentioned there are many other courses at top universities which will suit your academic ability which may suit your lifestyle more. It is quite true you have to quite intent on going into medicine as it requires a lot of dedication which from the attitude you had on the matter, it will probably not suit you so much, but hey, do some more research on what a medicine career has in store for you and to see if you will enjoy/be able to handle it.