This was a long read but a good one!
I feel I've been in this place before, I really do not like unnecessary attention and spotlight, I like to do things and stay hidden, stay quiet yet still shining my light in the little corners I find myself, leaving behind footprints that doesn't really draw too much attention.
So I really feel you but it's not a good thing to be afraid of fame, if you aren't just beating yourself up trying to be famous, but it just happens, it comes to you, then don't fear it, allow it, accommodate and embrace it cause it means that you are ditching out value, values that impact other people's life, this is why the spotlight came to you.
Sometimes we have these fears but it shouldn't consume us, we just learn to embrace it while staying focus and not losing ourselves in it.

As for sisterhood, I rather wished I had a younger sis too along side my elder sister.
So you are lucky to have one, you can set the pace for your younger siblings, you are already affecting their lives with values and that is a good thing, so be proud of yourself for being such an amazing person that wants to pour into women's lives.
I wish you the very best in your content creation