My stepson is mentaly challanged and is 16 going on 17 and he constantly tells me he hates me.t?

my stepson who i have been raising since he was 8, has been telling everyone he Absolutely hates me. yes i have in the past ruled with an iron fist so to speak, but have always showed him i love him and i am there for him. I have done more for this child than his own father (whom has never been in the picture). i am the one that grounds him or tells him no. he has said to me you love my brother more than me, i have told him i don't like the choices he makes but i still love him. it hurts when he says this over and over to other people about me. how he hates me! and the only answer he gives me for this is i wont let him on the computer. well no i still wont he looks up porno and lesbians having sex on the computer when he don't think he will get caught.he has done this several times and he makes poor choices. I told him he will not drive my car and his brother is and he don't seem to think that's fair at all. i don't feel he will drive safely, i can see it now this kid gets so distracted about anything he will easily be driving and go to the right of the road staring at a girls but , like he always does, and then hit someone because he is not watching the road in front of him, and he thinks i am being mean. i am only trying to protect him and others he might kill by no t paying attention. he should love me and respect me because i have raised him and his sperm doner wanted nothing to do with him, i took on his mental issues and all. and this is how he repays me??? by hating me????