You haven't failed silly, you did good, find a decent 6th form and pick some Alevel subjects you have slight interest in. Call the 6th forms up and say if they will provide a space with someone with similar grades.
Whats all this external business i don't understand? Go out there pick a decent school, get to work, stretch and challenge yourself and you will surpass many of your former friends and your peers! Don't reflect on your gcse's only, work hard for your future, it is in your hands!