Feeling Stuck in My Mom's Bubble

(kinda rant still looking for help and support though) It seems as if my life revolves around my mom and her schedule. I can't speak out or oppose it in any way and I'm not sure how to feel like me. I feel very stuck in her “bubble” Monday through Friday I watch her son. Then on Saturday I help her at her work. On Sunday I go to practice which she has also somehow infiltrated. If your thinking “you should get a job because then how is she going to force you to work all the time?” she won't let me. With all this work she only pays me $10 a day when watching my brother (from 7 to 13 hours) and then when I help her at work she pays me about $20 a day which keeps slowly dropping. Half the time she doesn't pay me and I end up not being able to afford things I need. She commonly threatens to kick me out as I'm becoming the age where my family sees that as acceptable. She does not let me set any boundaries and deems them “disrespectful” I even get barged in on while changing!