Why do I feel like my mother hates me?

I'm an 18 year old dutch guy and I feel like my mother seriously hates me...

Ive got vacation now and I work work work work my arse of because I've gotta pay everything for my studies (my parents won't pay for me but somehow they will for my sister) and every time that I have one or two days that I am sitting at home my mother will be bitching at me all the day... "I DO NOT WANT YOU SITTING AROUND AT HOME" and "GET A JOB LAZY BASTARD".

while my sister is just at home all vacation long playing neopets ffs...

why do I have this problem? my mother admitted that she likes my sister more then me to... what do I do?
Why do I feel like my mother hates me?
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