Parents looking at my fanfic

I started a fanfic about 4ish months ago that I have been consisterly posting chapters on every week since- but the thing is, my dad once saw me writing up a chapter on my laptop and demanded to read it, and has since found it and read it despite me telling him not to. Aswell as this, he has shared it with my grandparents and such (which luckily I got him to not send them the link) who have disapproved and said that I should wrote my "own original story".

I'm going to be honest, I am embarrassed about writing fanfiction, even if personally I write no romance or anything, and so having it shared with my whole family has really been pissing me off. He also constantly brings it up, asks about my readers and stuff even when I've repeatedly asked him to stop.

I wanted this fanfic to be for me, and me only + readers that dont know who I am.I had used it as a way to vent about certain things through characters and their own dilemmas. I just feel so annoyed and embarrassed that he has found and read it despite my wishes.

I genuinely want to take it down now, but that just makes me sad as I really do love getting encouraging comments, and people do seem to genuinely enjoy my writing. I just don't know what to do or say anymore to him to make him understand this is my private passion and I want it to remain under the radar.

Am I just overthinking/overreacting about this? I don't even know anymore.

Sorry for the rant, I just needed to get this out somewhere.