Read up about Foundation Years. A Levels are pretty much designed to see what subjects you can love even when it gets hard and frustrating, but you may end up finding you hate all of them.
In the same way, not having to study some things anymore will actually make you miss them - or grow an appreciation of them later in life. The sooner you learn about these, the better you can feel knowing no subject is truly "out of your reach", so to speak. Nearly every subject has one now, from English to even Medicine.
So don't feel like you're doomed if you "picked the wrong subjects" - you can still study it at some incredible universities, including most of the Russell Group, by making a case for a Foundation Year.
I can personally attest to it, having gone from getting a C in Maths at GCSE to now studying Medical Engineering at a Russell Group uni.