I really need adivce on my life!?

I'm fourteen, and I've been pretty depressed for a while now. But now I just feel like my life is falling apart. It started yesterday, when my family found out I ditched school on Thursday to go to town. My mum gets pretty annoyed and irritated with it, and she made me promise a few weeks ago that I wouldn't ditch anymore, but I still did. She doesn't really do anything about it, but she gets super mad. My auntie found out about it and called me then she threatened to smash me, so I felt like running away last night because she said she was coming today. And I believe her because she hits her kids and sometimes my cousin can't come to school because she has a blackeye or something. My cousin told me she couldn't be bothered coming over today but all of my other family like my grandparents who absolutely LOVE me, and my mum all wanted to give me a hiding :/ I feel like I'm letting them down so much. They all expect me to be perfect, and my nan tells me that out of all her grandchildren, I'm the one with the most "potential", and I'm also the eldest. They expect so much from me, and I just can't take it. They have my whole life planned out for me; college, career, kids. They all expect me to be a successful lawyer and to get into the best university like Harvard or something. And I don't even know if I'll live long enough to make it to uni. I don't want to talk to them about it, because to be honest I'm not exactly "emotionally" close with anyone in my family. I live with my mum, my two brothers, my sister and my step-dad. I want to run away, and I have this friend who told me that if I ever want to run away, he'll pay for my bus ticket and everything. I just want to get away from everything- all the expectations and pressure. My family thinks I'm strong because I always act like it, but I'm crumbling. It upsets me so much, and when I was talking to my friend on the phone and telling her what was happening I started crying, and I still feel like crying. It hurts me so much. My auntie was saying how I've disgraced the family and all of this stuff about the family name and letting down everyone. I hate it. I just want to run away. Or at least go live with my dad, but he lives all the way up north, and I wouldn't want to live there because it's a small town and really not my ideal place to live in. I love my family but I really feel like they hate me and like my life is just so stuffed up. Please help :( Should I run away or what? Should I ask my dad if I can move in with hime or if he can move closer? My mum won't like it, since my dad used to be heavily into drugs and is just getting his life sorted. But I can't stand living at home anymore! I need adivce.