STRESS

My 4marks GONE!!!! i know how to do but but but!!i dont know why :( :( :( :(
I AM SUCH A FAILURE!!!!!
i just stare at the exam paper. just tell me why!! :(
just tell me why,am i such a failure. anyone? :(
every marks count.you know what i mean.every exam is important to me,if you know what i really mean.
how i wish i can go back to the past and rewind everything that i did.but it seem, i cant go back to time again