loathe my younger sister

I've essentially hit a brick wall tonight and absolutely do not know what to do. I am nineteen and have a half sister of whom is thirteen and I really, really loathe her. I wouldn't go as far to say hate because I do not hate anyone but this gets pretty close. It's now at the point where I don't like her talking to me or being in the same room as me, looking at me ect ect. I feel horrible, completely "evil" in a sense for feeling this way about her. She's on the autism spectrum but is still highly functionable and just appears socially awkward. I treat her as best I can, be as nice as I can, but I find it almost impossible at times.
I don't like how lazy she is, how she hates doing the simplest thing like washing the dishes. She will outright defy my mother and gets away with it simply because my mother see's her as special, and from this emma has learnt that she can moan about whatever measly task when nobody else can. I hate how she won't learn new tasks simply because she doesn't want to, eg there are things she does every day like get dressed that are more complicated than putting the dishes upside down to drain or using a plate for a sandwhich but refuses to do so, though can navigate a computer fine. I don't like her disgusting habits like picking her ear wax and eating it, her nose and eyes and any orrifice seemingly. I don't like the way she will eat and eat and eat to obvilion and I know this is a part of her autistic tendencies but she will take food that isn't hers and eat it. If I ask her to do a single, solitary thing, most the time she will complain and then do a half assed job. The worst part is, even her obvious autistic traits annoy me like her wrong words in the sentence or slow getting up from bed and getting started, her literal thinking. I feel like the worst person on earth for feeling and thinking this way about her.
She gets let off easy from my mum and does nothing, absolutely nothing, and I am sure this is a contributing factor to how I feel but I'm not sure what to do. She is only my half sister and sometimes I think maybe subconciously I loathe her because her father (no longer in the picture) sexually abused me when I was a child. However this rarely is brought up in daily life and I don't think about him, or link him to her because she was so young. To me its an insignificant detail.
I don't know what to do. I feel like the worst person on earth. How can someone dislike their sibling so much they can't bear to be even touched or breathed on by them?
What can I do?

I sympathize with you -- I really do. I dislike my older sister for different reasons, but she was "pampered" too because she was sickly as a baby, but she got WELL -- still my parents continued to pamper her and she tormented me all my life and continues to do so even in adulthood!

Can you talk to your Mom about her? I mean, your Mom is NOT doing her any favors by letting her get away with these things because she won't be able to do these things when she becomes an adult! She HAS to learn how to take care of things around the house; how to get up and get around on time; how to "act" in public or in polite society; and how to use words properly. By ignoring all these things your Mom is doing her a HUGE disservice! She should treat her just as she treats the rest of the kids --- she should make her do her chores and do them RIGHT. She should eat properly & use dishes!! And as for the "ear wax" issue -- UGH. That shouldn't be tolerated, regardless of her issues.

Have a heart-to-heart with your Mom. Sis has to learn to take care of herself cause Mom isn't always going to be around. And YOU shouldn't have to take care of her when the time comes. In the meantime, remember it's not her fault. No one has bothered to teach her any manners, or discipline her. And she NEEDS discipline regardless if she has a mild case of autism or not. Kids need discipline and they actually want it. God bless & take care. Hugs, Lee

i can appreciate both of your points of view. mine is from the mom angle. my 10 yr old son loathes my 16 yr old bipolar son. no one seems to have much sympathy for the parent in my world - i imagine disciplining an autistic child must be as difficult as disciplining my bipolar son. my 16 yr old is a tyrant in the house. he has different rules than the 10 yr old. the 10 yr old does more chores, goes to school, behaves, and doesnt understand why the other child gets away with everything. i don't know why life has to suck so bad sometimes it just does. i'm doing my best, i have bipolar too, and a single mom. i want my kids to just love each other so badly, but sadly they don't right now. I pray someday they will. And I pray for some peace and answers for all of us. just breathe and maybe tomorrow will be brighter.