Extreme need of advice.(long)

I'm 17, I have a boyfriend who is 19. He lives with his parents still and he does work. He has a monthly car payment of around 300$, he has his phone bill, insurance, and Netflix. All comes to around 500/600$ go out in bills just from that. I'm 6 months away from turning 18, and I can't live in this house with my dad and brothers anymore. My mom never comes around to see me, she has some new boyfriend. My dad is a whole other story with the things he says and does. Same with my brother. I've fallen so behind in school so I'm about to be a senior with about only 5 credits.. I do online schooling. But I can stay in online schooling until I'm 22 I believe. I don't have a car, and I don't have a job. Anxiety is the worst, if you have it, you know how I feel. I wanted to get a job when I turn 18 to save up for a nice car. The plan was, I get a first shift job, come home and do school work, save up for a car. Then save up to furnish a home with my boyfriend. He's all for it. But it's too much to be in this house and to stay positive. The house is absolutely trashed. I live with 3 guys. Which like I said (dad, 2 brothers.) I tried being positive saying I wanted to clean up the house and keep It clean. So this is what the response is from my brother "get a job bitch clean it yourself, you're 17" it's so hard to focus on school when you have people like this in your life and there's nothing you can do.. If I don't do the dishes, clean the kitchen, bathroom, etc, it won't get done. I cannot clean up after 4 people, work, go to school, make time for my boyfriend and friends all at once. I need out of this house. Me and my boyfriend really just need our own place. We could do that once I turn 18 which is soon. I'm tired of picking up after grown men and being verbally abused. I'm constantly put down and it's hard to stay positive and focus in a place like this, what should I do? There's so much I want to do with my life and I want to get back on track with school, work on this anxiety to get my car and job. That's why I wanted to get a car before I moved out, so I could get a job, and go from me and my boyfriends house to work. Because idk where we'd live/if itd be walking distance.