My mother like my sibling betting its very depressing what do i do ?

well al i know is ending my misrible life i just would like some answers to change my mind so please dont go saying im stupid cause .. wel mabe i am but oh well so... i guess .. ill start explaining my self.. look people i and all people who have seen my mother and younger brother know there cruel my mother just keep praising my brother and im so sick of my stupid life its so worthless