Is it normal for a 20 year old to really resent their parents?

I wasn't a planned child and I'm the reason my parents got married. I've never been wanted by them. They never support me. I'm a great student, always have been, I want to a lawyer and they just laugh at me. They have never believed in me, they always 'expect' me to fail. My mom screams at me for no reason. I can't hold a 2 minute conversation with my dad. I'm just so opposite of them and I think they hate me for that. They've made a lot of mistakes in their lives - including me - and I've always done things ''right'' and they act like I'm abnormal for that. I played about every sport imaginable growing up and they NEVER came to a game, never were around to pick me up after school, games, practices ... I was told to "find someone else to bring me home." They never treated my older brother this way. I dont hate my brothe but I do hate my parents ... is that normal