vent about exercise

my step dad was trying to force me to go out side. well there was nothing i wanted to do, but he didnt care!!!!! i mean its my life, and if there isnt anything i have to or want to do i shouldnt do it!!!!!!! but then hes talking about how i should join the swim team, well i like to play in the pool, not go back and forth in a straight line!!!!!!!!!!!!!!!! if i wouldnt to do something i would have done it!!!!!!!!!!and then he sarts going on about how i need exercise cause im gonna get fat, well im pretty much under weight and its none of his bussines!!!!!!!!!!