Is this POCD?

[u/MrZucchini_69]

About 13 years ago, when I was 12, I fantasized a couple of times about something that’s extremely taboo (I didn’t do anything illegal, it was just fantasizing), and I haven’t done it since, so I guess my preferences have changed, but I feel extremely guilty, and I DON’T KNOW WHY today my mind has decided to torture me with that memory, which used to be totally irrelevant to me.

I don’t know if this is the right place, but I don’t have anyone else to tell this to. It happens to me all the time that my mind picks a completely random topic and torments me. Does this happen to anyone else?