Can you tell me what to do? (Long)?

Im 16-17. I grew up without a father. It wasn't at all tough, it got bad when I started High School. My mother put me into a school that is BAD. Drugs, alcohol, crime etc. I've been a good kid for all my life and peer pressure was nothing serious. I don't drink, smoke or do drugs, NEVER WILL. In grd 9 (2009), My mother promised me that i'd switch schools the next year, but didn't. She left me high and dry, so i went back to this school for another year. Every year for 2 years, she has let me down again. Im in grd 11 now. Everytime she lets me down, she blames me and it's painful. I've always kept my pain inside as I have no one to talk to. This yr again I stopped talking to her again as it's worse this year. But now, she wants me to feel bad for not talking to her by talking about how she'll die soon. She's 40, not sick and no disease what so ever, healthy as they come. Should I just let go and talk to her? It pains me to see her like this. But what about the pain she has and is still putting me through? Help