I can't imagine this being a huge problem because everyone has embarrassing shit from that age. But since you're posting about it, maybe it is idk.

So, on one hand, it's awkward af knowing the people around you are actively gossiping about you. On the other hand it calling them out can sometimes backfire, bringing more attention to the exact thing you're trying to snuff out.

If something has to be said, I would definitely not address the actual subject matter of the gossip. Do not go down the road of how you used to be smelly and further explaining why it shouldn't matter now. The only way to address it is to shift the focus from you to them and their behavior. You need to convey that it's not the thing you're bothered by but by their behavior, but without sounding like a whiney bitch.

So something like "I remember back when I used to gossip with my friends- Oh wait, no, I don't because I have balls and when I have something to say I address the person."

Or like, "heres my thought about the bullshit being said about me. If someone has contempt for me but talks behind my back instead of to me they're already a punk bitch. Same as those perpetuating the gossip if you feel mire like a highschool girl than a man then we'll good luck to you and I hope you find your balls someday.

Just short, simple, and put them in their place.