Advice ?

I live with my mom her boyfriend and 3 of my siblings, im trying to finish my last year of school and im looking for jobs and i do everything around the house my brothers 16 and 23 dont do anything but smoke weed and they dropped out and aren’t looking for any type of employment but my mom literally treats them like kings. My sister 12, just sits in her room all day talking to whatever boy gives her attention that day, i clean everyones room make beds, do dishes and laundry, clean bathrooms but its never enough if i dont do anything atleast for a day she’s yelling and cursing at me about how she has to do everything around the house and how im lazy i just wanna know why she treats them like gods but treats me like nothing.