my little sister is so spoiled and i honestly cant stand it anymore?

she gets everything and everything handed to her, when i had to EARN everything i got.
my mom said im a selfish spoiled bit*h, if i was so spoiled why is the money i have money i EARNED from babysitting.
but whenever my sister whines she gets stuff handed to her.
mkay so i am older [im 16 shes 11] but even back when i was 11 i had way more responsibilities,

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EXAMPLE:
i wanted a pet fish, i had to take care of it, a few years back i got a blue beta fish lmfao that fish was the best [RIP bob 9-11-07 tear] yea she really died on 9/11 anniversary. well i got her in april 07 and my sister got mad and got a hamster and my aunt felt bad and didnt only want to buy my sister something so she bought me a hamster also [4-21-07 lol my hamsters bday] my sisters died in a week then she got another one that died in a few months, she didnt take care of it! my mom did. if that was me my mom would hav made me take care of it or give it away. i saved all my money n bought a 10 gallon aquarium and my sister got mad and my mombought her a beta fish…that died cause she didnt take care of it or feed it.
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i honestly cant stand that BOTH my parents let this kid walk around doing and saying whatever she wants but i will get in trouble.

she cursed me out in italian and my mom ignored it, i said oh that sucks and my mom started screaming at me!

and then my sister said oh that sucks and i asked my mom why dont she get yelled at and she was like if u can y cant she
um cause im 5 years older?
tried telling her.
my mom yells at me and blows it off.
shes in total and complete denial and so is my father.
she bought face wash and was lik eoh u can share with ur sister and i was like omg why do i always have to share with her!?!? adn she was like omg u know what i really bought it for her adn u can go to the store and buy your own stuff