I too am a non-confrontational person with an overbearing younger sister, and the best advice I can give you is to try talking to her anyway. It doesn't have to be confrontational in nature when you talk to her. Being yourself, you can probably find a way to approach it tactfully, right? I'd say just keep it simple, be nice, but say what you have to because otherwise you will just build resentments and when you've already got twisted family dynamics that can kill your relationship. And you and your sister don't need that on top of the other challenges you've alraedy had to deal with.
After the death of my own (also somewhat screwed up but lovable) mother, I was faced with the fact that my sister was the only relative I had left. Out of respect for both myself and her, as well as for my mother, I started trying to be more direct with her in an effort to open up our relationship. I was surprised to find that she both understands me and respects me for who I am, far more than I ever realized. Not only that, but she actually looks up to me, like little sisters are supposed to. I never would have known this if we hadn't started talking more honestly, and now I feel more free to just say how I am feeling, which is a weight off my shoulders. I have been able to start feeling better about myself when I stand up to her, and she still loves me anyway because she's my sister. I don't know how much of this applies to you but I hope it helps.
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