How can I move out when I'm 17?

I’ll be 17 in august of this year. I dont have a job or a car. I’m working on that one. I go to school and I have a boyfriend, but hes not moved out yet because hes still looking for a house. Me and mother get along to the point where we can look at each other, joke around a little, eat dinner together, not kill each other while she works at the same school I go to, and barely live in the same house. We argue so much that I actually considered suicide, but never worked up the guts to attempt anything dumb like that. I’m completely over that now, but we don’t ever stop. She’s extremely cheap and won’t buy me a decent truck or car that actually runs or that even looks like its a vehicle. We argue over the stupidest shit simply because she thinks shes always right and when I am she just treats me worse than shit. It wears me down so bad sometimes that if I had a vehicle, I would leave for days and not let her know where I was because shes so rude and snooty. I want out to keep myself from overstressing like I have in the past, and save my sisters the heartache of having to hear their older sister threaten to leave their mother because of the terrible treatment all three of us get Please HELP!