this reminds me of one of the first people I ever came out to. I no longer talk to this person, she has issues that I tried really hard to help her with, I was a very good friend to her but then she cut me off on the day my grandmother died and then a week later messaged me like nothing happened. anyways.... I was talking to this girl about transitioning and she told me that she thinks that she would still be herself no matter what body she was in. Such an ignorant statement to make, I really lost a lot of respect for her when she said that, she's the kind of person who has a really hard time seeing things from another's perspective, and then she throws a fit when people don't see things from her point of view. She used to be ridiculously late to things all the time and she didn't care, and when it happened she would always blame it on being female, claiming it was hormones, and she did that when she did lots of ditzy things too. um, no girl, it's just you being lame, most girls aren't like that at all!! One time I even told her about a trans rights march that I wanted to go to and she actually told me I should probably be farther into my transition before I become an activist. WTF?!?! sorry, this stirred up old memories and I needed to vent lol
I know your sister's opinion means something to you, but this kind of thing can be very hard for others to understand. Just stay true to your path and be yourself (inside and out!) and you'll be happier, and when she notices your happiness she may end up coming around on things 🙂