Desperate.

So I've been having to stay with my sister, her bf, three other people and a baby for the past month ever since my bf and I started living separately. I don't have a room here and I'm supposed to be working for my sister's bf at a popular bar around here.. I was supposed to be working and saving money but ugh it's so hard. I'm 19 I don't have a car or anything so that sucks. But to make matters worse, all the money I make at this job is going straight back to my sister and her bf so I can actually have a room in their house. But of course they don't even plan on staying here past May of next year so I don't see the point in wasting the money I could be saving for a car just so I can have a room that I have no furniture for or anything especially since they plan on moving in the next six months anyways. Idk what to do. I mean I guess I could get two jobs and walk to them every day. That means more money which means I could get a car faster maybe. But I don't have anything like my license either and I have no one to help me with that I don't think. So when they move I'm gonna be in an even Whittier situation bc I won't have money for a car or a place to live. I'm so stuck right now like Idk what to do