How do i handle my mom liking my sister much better than me?

its about a 2 and a half year difference im the youngest. for example (real examples) my sister was laying on the couch (6 piece couch end chairs are recliners) i asked her to move so i could sit down and watch the movie with them (cause my sister was taking up 3 seats and a recliner, my mom was on the other recliner so i would get one square). my sister replied with "well you cant just go in the other room and then expect to sit on the couch when you get back" i told her i had to take a call. my mom took her side and suggested id take the ONE tinny square of a seat that was left (side not my sister is 5'2 I AM 5' 8 and my legs are very long... doesnt make sense". if me and my sister ever argue and my mom comes in she will automatically blame me, wont ask what happens or anything. she just assumes. my mom seems to love when my sister says they look alike. when ever someone says that i look like my mom she replies with " i dont see it" ( does she think im ugly? me and my sister look nothing alike. we are both petite. but shes short im tall. shes my half sister so shes blonde and i have dark brown hair. she has medium hair i have long hair. shes full italian and asian. and im armenian, italian, asian, hawaiian, puerto rican, black, and dutch. she fake tans. i dont so im usually kinda medium tan or fair. as you see we look NOTHING a like. although her and my mom have the same hair color my mom has big eyes like mine, and big lips like mine etc. so could that be it?). i notice little things like she ALWAYS serves my sister first. she ALWAYS listens to my sister. no one listens to me when i talk.my parents and sisters (i have 2 older sisters but i only have this issue with one cause the other doesnt live with us shes in college) ill talk and they will either talk over me, 100 ignore me, or listen awkwardly look at each other and change the subject like what i said holds no importance. and i can see me having issues with feeling ignored bring a lot of havoc to my life in the future. i can easily get attention from guys so what if in the future thats ALL i feel like i can do and all im worth then ill have so many issues. when i was younger (9-ish) i thought it was ALL MY fault but as i got older i realized i tried. i tried hard to be the person they would like and pay attention to it just never paid off. my mom lets my sister get away with everything. like she doesnt get mad at her for anything. she will come in and see water spilled on the floor and be like "victoria, did you do this" and a super mean/ annoyed voice ill say "no, jessica did" then she will be like "jessica sweetie will you clean this up soon" in a nice voice. she tells me "its a good thing your pretty cause your not very smart" and little things like that. she always brings me down. its not out of jealousy i mean i know jealous moms and thats not her issue she just doesnt like me. am i over reacting? put yourself in my shoes how exactly would you feel?