I need some advice

So I’m going to apologize in advance cause I’m not exactly sure which group to post this in. If you think of a group more fitting i have no problem moving it/deleting it. But i really need advice. I moved Im with my best friend and her family Im February. Im 18 snd she just turned 18. Our plan was for her to graduate and us get jobs and move out in December together. That plan fell apart rather quickly. She stopped going to school and her mom said she can’t move out till she graduated. I got a job but lost it the same week because of the pandemic but I have been busting my ass trying to find one. (Had an interview a few days ago send positive vibes I really need it). So I haven’t been paying rent or anything. I help around the house a lot. I babysit her son almost everyday and am the only one who helps around the house. But i feel like it’s getting to the point where they are taking advantage. They leave for sometimes days without telling me and leave the 9 year old son. He doesn’t really listen so it’s hard. I don’t ever ask for anything and when I do it’s usually because I really need it. I legit eat here like once a week and spend basically every night at my boyfriends. My best friend has completely changed how she treats me and they all are super mean. I don’t know what to do or if I should even do anything. The reason I finally feel like something should be said is today they went to get their nails done. She told me she couldn’t afford to get mine done which I truly didn’t expect her to anyways. But i found out she’s paying for my best friends other friend? When I don’t get anything for babysitting or anything I do. I cook, clean, take care of all the pets, etc. I just feel kinda annoyed that she “couldn’t afford” it for me but could for someone else