I need advice halp

Need advice:

Someone I know never used to watch anime but now they cause of quarantine, it kinda made me feel....stingy. Yes I know that sounds dumb as hell but I don’t really feel that way anymore.

But now they have found bl...this is most definitely gate keeping but bl was my thing and now they found out and honestly I don’t like it...like sometimes I’m ok and other times my not...and they are too young to be reading it. Like just the thought of them looking at such inappropriate pictures makes me feel weird. I blame tiktok for this.

It’s my sibling btw.

(I’m 19 and they are 14)

You guys say can how dumb I sound because honestly I do but I really just need some advice PLEASE help me