Need Advice / Feeling Low

I’m 16 and it’s exam time it’s my first exams ever and I sat my only exam today because you gotta be smart to do exams in my school, I’m only doing one and my friends are doing like 5-10, I’m not good at any subject I’m like ok. My only exam was a maths, basically I feel really sad because my family have a group chat with my cousins in it too. They were wishing us good luck for our exams and my cousin has 6 exams where as I have 1 meaning she’s smarter than me and I just feel like a disappointment

Please tell me any one here felt like this