You are worth a lot more than the grades you got(early entry) or going to get on a piece of paper so please dont let those grades decide your fate. Also there are other options for example Btecs so its not completely the end of the world if you dont get the grades. You did the best that you could and if you have not i guess you have learnt your lesson that its though out there so be prepared...Remember life does not go in a straight line so dont stress of over exam results...as it is not all about going to Cambridge or oxford-you dont have to go there to make something good out of your life so do what suits you.
Always Remember "Winners are to busy to be sad, to positive to be doubtful, to optimistic to be fearful, and too determined to be defeated."
Edit: It is not all about a piece of paper with your name on it