y all this happen to me !!!!

all the ppl also go to acc class le......only me alone in science class.....T.T..... very big stress !!! all the subject biology,fizik,and kimia i don understand !!! who can help me ??.....!!!.....haiz...y all this happen to me ?! y i cannot change to acc class ?! y i will be alone in class ?! y no body choi me in class ?! y must i in the first class ?! .................T.T...........................