Why is my sister so weird?

brunohusker
Okay, my sister is so different. She wants to be a writer or journalist, and while she is talented at writing, isn't it a dying career since we are in the internet age? Also it's not just that,she doesn't take care of herself. She had bad teeth (part of it is she has bad enamel because of medication my mom took, but still she hated using toothpaste until she was 12 and drinks about 2-3 bottles of mtn dew a week during the school year since at home we don't buy pop), also she has no motivation to lose weight or look good. She has bad acne which she can't control, but she went on medication and it's better but she still has it. Also she has no motivation to lose weight and even though she's been a bit bigger (she's 6 ft1) she has now ballooned 220 lbs,and while she doesn't look terrible big, her gut is big, and whenever we in my family tell her she says "why are guys like you (me and my bro) allowed to have fat beer bellies hanging out while I have to be skinny"She also doesn't exercise and spends all day reading and watching TV and doesn't want to get active unless we fix her bike (which is weird since she hasn't ridden it since she was 12 at least), and the sad thing is she isn't happy about her weight, she just accepts it. Also she's so mean to us at home while at school she never says a word, leading to her not having many friends outside of speech time or journalism, and even there she doesn't have too many. She also doesn't drive and I don't know if she really wants to. To top it off is the meanness I mentioned. She always corrects my brother who is autistic about stuff he can't control, or corrects me, and it sucks. I honestly don't know why she's like this. She just seems to be a ticking time bomb. She's going to college this fall and I am worried she won't do well. She was smart but never got great grades and wasn't very socially adept, and also I'm worried her weight and quiet personality outside the home will make social life tough. What am I supposed to do? Is she a lost cause?
Updates
+1 y
Another question, is it okay that she thinks she isn't normal and is okay with it. She says that the reason her and my mom fight is because she wants my sister to be normal, and my sister says she isn't normal.
Updates
+1 y
Also, she once again said she isn't happy being fat, but accepts it, and always yells at mom for wanting her to be skinny and "normal". So she likes being wierd. Why?
Why is my sister so weird?
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