Why is my dad so mean to me?

My dad is always brining me down, I try to ignore it and think of other things, but i just cant. He yells at me for little things almost everyday, always yelling. He blames me for being so bad, and when i try to ask him what i do wrong, he laughs or says i dont get it, and when i ask him what i can do to be better, he just says he doesn't want to talk to me any more. This really gets to me, i usually just end up crying in my room and cant hold it together in front of him, we always fight and yell and i just cant take it! I've had quite a few experiences when he has called me bad names, and when i confront him and tell him that it truly hurt me to a big extend, he scoffs or says "oh no it hasnt! dont be a drama queen" i feel like i cant talk to him or show emotion, he gets my hopes up by trying to be good then just knocks them down, he criticizes how i dress or my makeup, and it lowers my confidence badly. I lost my mom 10 years ago, and i know its hard for him but why does he have to be like this? i encourage him to hang out with his friend or go on dates but he just sits at home. I want to make things better so he'll be civil to me, I want to do things like clean the house so he'll like me, but I try and i just think 'why am I doing this for a person who treats me so badly?' its so hard. He always makes jokes how my sister is better than me, and how she always goes first, and i cant help but think hes serious. And when he gets mad he says he hates me. I try to ask him if therapy will help but he says it would help and just laughs and thinks again that im a drama queen. I saw a girl on the street with her dad and they looked genuinely happy and it made me cry. i dont know what to do? anyways, thanks for reading this long thing. i really appreciate answers.