i need help choosing a bedroom aesthetic!!

me and my family are moving soon (hopefully:p).

its gonna be a 3 bed and ive got two older sibs 22f and almost 20m.

for some context, ive been living in my current home my whole life and have been sharing a bedroom with all my siblings.  my other eldest sister moved out a few years ago after having my neice.  so ive always been in a tight space, meaning i dont have a lot of room and i have to be mindful of how i decorate my room.  so in my bedroom right now i dont have much thats decorated besides my bed, wardrobe and the wall infront of my bed. --> ive got atleast four posters on the wall and some more in storage, i keep all my figurines and trinkets in my wardrobe, so my wardrobe is in a state :((

some good things about this new house were hopefully going to be moving into is the 3 bedrooms, a small back garden/yard and side garden which can also be used as a park in since its not grass its made out of concrete :DD!!   a few negative things about the new house is that the kitchen and front room is gonna be slightly smaller because of the extra bedroom, another negative is that the toilet is going to be in the bathroom which means if someones showering or bathing no one can use the toilet until someones done washing (im sure thats okay). 

since my brother is the only boy he's going to be having his own room, probably the smallest bedroom.   ill still need to share with my sister and my parents think they should give me and my sister the biggest room so we can fit both our beds and wardrobes (maybe a desk each but idk). the difficult thing about me and my sister sharing, is how we both have the most opposite aesthetics.  shes into a very plain beige and white vibe, on the other hand i really enjoy either really dark colours or bright colours like yellow, pink and lime green.  i also have a somewhat weird vibe almost like josiekay, i want my side of the bedroom to be very geeked out, i want it to burst with all my deepest interests and i want it to show my quirky side. --> i have already told my sister about this and her response was something along the lines of "it wont look good", "imagine when family comes over and sees our room, then they just see that shit on your side of the room" and "it would look so depressing to live in that, plus it will look really filthy".  like jeez thanks i guess  ("*-*)..   

i also need to decide what stuff im going to keep or get rid of, im probably going to make like a depop page and sell some stuff that needs getting rid of, and maybe as another thing i could make diy shirts to sell.  whatever i sell and make money from i can use to help my parents furnish my room or hire the van service.

another thing i have to mention is that i own 11 pets ("*-*).. 2 dogs and 9 cats, we are taking them with us but i hope the new home will be enough for them, because i know my cats have a habit of climbing basically everywhere and anywhere they can in the house.  so hopefully the money i make from depop aswell can also go towards funding in toys, beds and a cat tree for the cats (same goes to the doggies!!).  we also have a cat that has a strange habit of peeing everywhere, so its constant cleaning for me and my family ("*-*).. 

aslong as im able to make some money (it doesnt matter how much it is to me :DD), i would be really grateful :))

ill make a depop profile soon and will do a clearout before we move and decide what i can sell and get rid of.  and if i dont make a depop page ill probably get my eldest sister and her boyfriend to sell some of my stuff on their vinted page and they can pay me back whatever they make from my items :DD.

 thats all for now, bye bye!!💗