not that deep bro, like someone else said if you're good enough to apply for Cambridge chances are good that you'll end up at an elite uni regardless, perhaps top 5 RG unis or something, or maybe one of the really good non RG unis, either way you'll be fine. I know it would have been amazing for you to end up at Cambridge, for many people it's a dream, but keep your head up because you're going to go to an amazing university I'm sure - and I don't even know you.