Math igcse is heart breaking. can i have ur advise?

i was feeling damn overwhelmed when i stepped into school ground! cuz one of my friends saw me and they scream my name and there goes all the girls running and screaming onto me, like a stampede. wishing me good luck and stuffs. i am so happy. but then when exam comes, i couldn't do it, after all the hard work my mind was blank..i don't know what happen. i did the math paper worst! I DID ONLY LIKE 3 OR 6 QUESTIONS. i did it miserably. the teacher said don't worry about it and everyone experience the same thing. I was like oh yea? How am i going college? i have lose my confidence. my heart hurts and i can feel my heart went down to my stomach. :(