Should I just leave or should I tell her?

So my mother has made me depressed for the last 6 years. I mean it has took its toll on my weight, my grades, to the way I think & function. I feel like I was robbed of a childhood. She gets angry about any little thing & starts fussing & even gets abusuve. I feel like I don't matter.  I planned on moving out, and moving in with my BFF when I'm 18 (in 2 years) or 17 (it's legal to move out in my state at that age). I did plan on getting a job next January to save up. But when I leave I'm debating on whether I should just leave (without letting her know), tell her what's wrong now (she's very irresponsible, and acts like a child at times), or Leave a note explaining why I left. 
I do plan on never speaking to her again. 

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