<human>: Can you provide a brief rundown of the text in within 3 sentences?

I know how the title seems but it was the shortest way to say all of this.

My mother is 36-37, she's on disability because she has panic disorders [weather] and something is wrong with her back. Keep in mind, she is fully functional. She walks, eats, etc - everything on her own. She could get a job if she would try and work with her disorders. [Please don't take what I said the wrong way cause her panic disorder isn't very bad]

I am 17, working two jobs to support myself and sometimes my mother [when she doesn't pay a bill or just needs money]. I start school in less than a month and I'm trying to save up money for a car and school clothes/supplies. 

She on the other hand has been out for a week and a half with her s/o because she's been "dope sick" for like a week or so because she's trying to stop taking her pain meds [for her back]. 

I feel like I have no support system and I'm tired of having to step in and pay her bills because she blew her money on bullshit like drugs or coca colas. 

I'd really love some legal advice. I don't turn 18 for another three months but I want to live with my sister now. She won't give her custody so is there another way I could go around that? I don't think I can be emancipated, it's too close to me being 18. Help Reddit :(
<bot>: My mom is acting like a teenager while I play mommy and pay the bills and slowly die from stress. Help me find a way to legally get away from her.