How do I tell my parents that the treatment between me and my siblings is unfair without getting lectured?

So I'm the eldest (17f) and I have two younger siblings. Both my parents are working so I've been taking care of my siblings. I started cleaning the entire house when I was in 6th cz my mom wanted that of me, this included tidying, dusting, vacuuming, washing dishes etc. now I'm in the last year of high school and so stressed and tired but I have to come home and clean everything while my siblings (15f and 12f) do nothing. They just sit down and doomscroll. When I bring it up with my parents they're always saying how my sister has to walk to and from tuition and she's tired so she doesn't have to. But it's vacation now and I'm so exhausted cuz I wake up and don't stop working until I have to go to sleep (constantly doing dishes, serving food).

My siblings don't even care when I literally beg them to clean. My parents aren't even doing anything cuz "it's my responsibility as the eldest" today somehow my mom made my younger sister vacuum but she didn't even clean anywhere, there's dst and cat fur around the house. I have slight ocd so it genuinely bugs me so much so I keep telling my mom "please ask her to clean" nothing.

I lost count of how many times I've asked my parents for help and they just said "you don't even clean properly anyways" or "they're kids" while I've been doing everything since 6th grade...