how to deal with disappointment

Hi, I’m a Year 12 Student and I’ve just received all my mock examinations. I take Biology, Chemistry and Maths and got A*AA but I can’t help but cry everytime I think of these results. I studied so so hard for my exams, during the holidays I studied for 12 hours at times but I was not burnt out, I was still sleeping well and I enjoy learning, and since I enjoy my subjects, it didn’t feel like burn out. If I ever was burnt out, it was during the last week of exams however I performed best in those exams. I know it sounds ridiculous that I am upset, but I just am, I expect so much from myself and I need to be this picture perfect student because it’s the only thing I am good at and where I get my source of validation from. My parents don’t pressure me much, but I feel like my father is disappointed whilst the mother doesn’t seem bothered and she keeps questioning me why I am upset. I think this is because she spent a lot of time hospitalised during the period I was studying, so she does not quite know how hard I worked for these exams. Although these grades do not matter, I just feel so bad about them. My predicted grades for UCAS are likely to be A*A*A* or if harsh, A*A*A. But I can’t help feel so angry at myself. I have always been good at maths and have never gotten below a 95% in year 12, I also got around 96% in my GCSE so I never often underperform in any sort of examination, but my whole entire pure maths paper was just full of silly little mistakes which cost me all my marks and I don’t know how to feel. I feel like I’ve just lost all my academic abilities and I’ll never be able to perform well again.