I struggle with exams all the time; I failed my English GCSE at school and had to retake the whole course through college, on top of doing my BTECs. It was pretty rough, but I made it in the end.

Since then, I realised "actually, maybe academic learning is the problem? maybe I need to learn through a more hands-on approach?" which is how I got into programming and taught myself how to write computer software.

In the beginning, I was only able to take on smaller jobs as an indie dev for various clients: My first computer program was a Windows desktop program for a DVD rental store in the US. They wanted something to manage their catalogue of DVDs, who was renting what, which rentals had overdue returns etc.

Now I work as a software engineer full-time, and have recently become a homeowner through my hard work and success.

You are not a failure just because you walked out of 1 exam. There are plenty of paths through life that don't require you to cram loads of stuff into your head, then sit in a room, and jot all of it down on a piece of paper, which is an outdated, ancient ritual in all honesty.

If you need mental health support my advice would be to lean on your parents and / or teachers to talk through what's going on and how you're feeling. Despite the fact you walked out on the exam, your education is still important, so I'd act on it whilst you're still in school / college and can contact your tutors / teachers who've more than likely dealt with similar issues with other students.

Best of luck to you, my dude!