being the youngest daughter.... how do i gain freedom?

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i am the yougest daughter of my parents. my older sister as i would say is quite envious of me because my parents attentin is all on me. they would compare oue grades and so, sibling rivalry rises. my two lder sister would call me "bratinela" or spoiled bratt. but what they don't know is that i am sick of gaining all the attention. im so sick of being treated like a baby.. im already 18 years old and i can take care of myself but my parents are still very protective that i sometimes want to drown myself and just dissolve int thin air.. what should i do for them to understand i need freedom...