All She Does Is Yell

How am i suppose to know what to do when all she does is yell? My mom cant seem to shut up. She keeps talking all this crap about me saying i dont know how to pack when she needs to explain it to me. How am i suppose to know what to do? I never had to pack before. I know i sound really dumb but I just cant handle all this stress. She just makes me seem stupid and this makes me not wnat to do anything right at all. I just want to say forget about it and leave me here. I certainly dont want to be is this family anyway. I hate it. Im practically being disowned because i told my mom's bf that i dont like him. Everything is just going downhill for me in this family. I feel like I dont belong and honestly I really feel like I dont. No one wants me here anyway. Im better of just living with my grandpa bcuz i cant handle the neglect and the disrespect I get in this house. It's unbearable and it makes me just want to be worse.