Please read i need help. i'm 16 and need to get outta here?

really don't like where and who i'm living with. i live with my mom two older sisters my lil brother and my gma. now my gma has been taking care of us since we were born so she expects things from us. she basically treats me and only me like an orphan she hates me and has always hated me, i've tried understanding whats she has been through and all her dislikes and we've tried to get along but i just can't stand her any more i honestly hate her when i should love her just for the simple fact that she's always been there for us but it's so hard to do so. today she called me worthless and a slut etc. i'm so depressed here that i don't even want to get out of bed at all. i'm getting worse and worse and the only thing holding me together is my boyfriend we're in love and he said he wants me to move with him and his dad. i want to but then again i'm still so young and i don't want to just for that fact. after everything that happened today my sis came and talked to me and said that i can move with her and my niece at the end of the year, she's getting a three bedroom house. now my choices are dropping out of school getting my ged and getting a job, going to court and having me and my mom divorced or something like that so i will basically be considered as an 18yr old i think. (can any one who reads this give any info on that pls, i don't know too much about it), getting a permit and a job and waiting for my sis to move, or a job and moving with my bf. please help. if you have something mean and ignorant to say pls don't because you have no idea what i have been through. thanks to any one who just looked at this. thank you!