Why would my sister touch me in private places and act so weird with me?

Anonymous
i'm just 16 years old, i live with my sister because we don't have parents. she's 20 years old, she used to treat me very well but she became really different with me now. she's watching me with her eyes all the time and before a couple days we were watching a movie together and she jumped on me suddenly, and she told me that my skin is soft like girls and she was touching in private places. then she told me " i wish you were a girl, there must be something wrong you can't be a boy you're so sissy" she sound scary, i don't know why she's acting like this with me. i don't know what to do please tell me, i don't have anyone to talk to. i'm a good guy and i have a girlfriend too, why would she treat me like this?
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+1 y
THIS IS REALLY SERIOUS AND I'M NOT TROLLING HERE IF YOU CAN HELP ME PLEASE DO IT BECAUSE I NEED IT MORE THAN ANYTHING ELSE.
Why would my sister touch me in private places and act so weird with me?
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