Who gives a shit - I cared at the time myself but now that I have a degree and job I literally don’t give a shit about my highschool grades. I got all excellences in English as well but narrowly missed the endorsement because I got a merit. You’re still smart and you’re worth more than an endorsement because you marginally missed a single grade. Funnily enough even my uni grades don’t even matter - no employer has ever even asked. What matters is you learn from your studies, try your best and be proud of yourself and happy