difficult home situation, need advice?

Let me start by saying that I’m an 18 year old female(almost 19) and I live with my mother. When I was a child my mom had a serious meth addiction and so my dad had full custody of me. When I was 11 he unexpectedly died one night(heart attack) I found his body. After that, I began living with my mom but her drug problems just got worse and she was unemployed. We lived off the social security that I got from my dads death. After a year she started the kitchen on fire and the landlord kicked us out. That’s when we moved to my grandmas house in a city about 6 hours away. There my mom got clean and got a job, saved up money and we got an apartment an hour away. As I started high school I experimented with drugs and when my mom found out she started doing them with me. She would even give me money to buy them for her. I slowly started failing classes and I ended up barely graduating. My teachers would tell me that I needed to move out, to move in with other relatives, anything to get away from her, I knew they were right. My dream was to go to university but I was told I had to finish a year at comm. College first. So I decided to live with her for another year while I went to comm.college. After high school I stopped doing ALL drugs, I just got tired of them. My mom still does them though and she abuses alcohol sometimes too. Anyways I got a part time job, and I get monthly checks from my dads estate, so my mom makes me pay her 400 to live here because otherwise she couldn’t afford it. I started school, enthusiastic about having a fresh start, and a week later my cousin commited suicide. That tore me up, and I missed several days of class, putting me behind. I felt like I couldn’t do it, so I dropped my classes and vowed to start again next year. I continued working. My cousins son found his body so I am very close to him now because we share a similar experience and we are close in age. I go visit him almost every weekend and I really want to move closer to him and my other family. I’d like to get a job there and start school again. I want to get away from my mom and her issues but its really difficult to do by myself. She is very dependent on me and is very emotionally unstable. I feel like I’ve had to be the man of the house because she always makes me fix things and I feel like I have to be the backbone for the both of us. And recently she started threatening to tell my financial advisor to stop sending my checks. I feel trapped. Help please! Advice? Thanks