Anonymous wrote:OP, your sister's behavior is shockingly like my own older sister's - from the relentless insistence that I do things her way to using me to take care of my little niece and nephew (whom I love dearly) . . . even to suggesting that my referring to the man I was dating as my boyfriend was, for some bizarre reason that she never clearly explained, "slutty." I'm very shy and conservative and about as far from "slutty" as a cloistered nun.
Those were the non-problem behaviors, relatively speaking. She became progressively a lot worse until eventually I had to cut off contact. In hindsight I realize I contributed to the problem by tolerating really ridiculous behaviors, and that may be something you might want to consider in your situation. It sounds like you're tolerating your sister's behaviors even though you're unhappy about it. She's not going to start being appropriate when you're still tolerating inappropriate.
I agree with this. the behavior of OP's sister is abusive, and OP sounds under the sister's influence because it seems that she needs her sister's approval. Op, you say that your sister's behavior drives you nuts. you should simply ignore her and actually stop discussing your life choices with her. when she opens her mouth you should tell her that you have made up your mind and do not need her input, and just walk away or change the subject if she insists or says that she will get your dad involved (this is ridiculous, you are not 5yr old). just never, ever engage her, and never ever justify your choices and decisions with her. if she calls you a slut, you need to tell her that insulting you is unacceptable, and that she must apologize. do this every time, and do not let her convince you that you are overreacting. you are not. even if she does it as a joke, this is no loughing matter, it is a form of abuse and you should not accept it.