Anyone else have a fake Facebook?

I used to be big into an alternative rock boy-band when I was younger and I was on forums and such. I made a fake Facebook because I wasn’t comfortable giving my real one to people on the forums.

I still have it 20 years later and occasionally use it when I want to post something in like an advice group but don’t want it tied to my main account. I stupidly made two similar posts over the months on both accounts and an admin of the group messaged me to tell me I can’t post anonymously anymore and how I posted on a “fake” account. I feel absolutely mortified and no one else(not even my husband) knows about this account.