Useless of me .........

today i don't know y i will think this , i feel that i am useless people ... i cant do well in my examination , every time i think about my result i start to cry ,sad ,no mood at all ... y i am useless people ... i cant think my future will become what ... my English teacher say my essay is worse ,bad ... when i hear that my heart start to pain , sad ... i also don't know i will become the leader of dance club ... i think i useless , cant do anything ... i ready want to end my life ... in my family i the worst one ... i like only continue wasting money in my life ... i ready don't know what i live for ... who can tell me what should i do ...