Annoying family??

So it goes that my family has a bit if a strange dynamic, and being back from uni can be the most irritating thing, especially as i may be commuting this year to save money (restarted because of changing course). U am the oldest of three here (i’m 20) and i feel attacked quite often, as i have a different dad to them (not that it should generally make a difference, but in my case it makes them relatively different from me, not feeling the most like actual siblings), but the real issue is where my mum has 1000% more respect for my sister - i say this with a grounded mind because there is no difference in the way anyone is treated but it’s just the level of respect is irritatingly different. You see, my 3 years younger sister is the outgoing, partying, popular/always having plans type, whilst i am a lot more shy/less social, and i know that my mum HERSELF was also the more studious type like i am, so as our personalities match more she feels okay talking DOWN to me, almost as if i’m a child and it is the most aggravating thing ever, she even pins the others against me, like for example she told my sister i “had a go at” her because my sister used my towel (in reality i had literally just said “why has someone used my towel? It’s fine”, when she speaks to my sister, particularly when she is listening to all the happenings from her time out with friends etc, she will literally put on an accent (the type you would do if you were on the phone to someone higher than you/someone you were keen to impress). It’s just so aggravating to be spoken to like a child/spoken to disrespectfully especially when i know nobody else does that to me, and i’m sick of being compared conscious or unconsciously to sister. I suppose the answer would just be to get closer friends and get away more? I really don’t gave the money to move out this year, especially seeing as last year i was in a very expensive uni town, does anyone have any advice or similar experience?