Family & Friends

Is my relationship with my sister toxic and what can I do to save it?

I (f21) have a younger sister f (19). Since around 14, she has been having some mental health issues, I've had my fair share too though, but at this point, I feel like I can't keep saying its just that. I'm barely able to hold a conversation with her since if I try to get beyond the polite conversation you have with an aquaintence (example: How her schooling is going, is she seeing anyone or how her friends are), she'll either give me the one word "okay" or just snap and ask me why I'm asking. But then if I complain about our lack of a relationship, she accuses me of never texting to make plans which I'll admit I don't but what would we even do when we can't even talk properly? She bullies me, puts me down about my quirky behavior, brings up embarrassing things and will put spins on situations that make me feel like absolute scum. I'll admit, I am by no means a perfect big sister. I sometimes say the wrong thing or will bring up an embarrassing moment or two but it just feels like this isn't normal. She's sweet to me if I'm unwell or if she wants something - if she has a bad day and is crying, she'll be all sweet to the family but within a day or two is back to her usual behaviour. I just want to build a relationship with her as we're both getting older and in different universities, but it seems like nothing I do is right. I'm not going to change my personality for her (ie being a goofy dork) but I just need to know what y'all think and if you have any advice.

Is my relationship with my sister toxic and what can I do to save it?
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