Whenever I think about embarrassing things I did in the past I cringe so much.
That's really unfortunate. Why can't you stop cringing at them?
I don't know, I just feel like I shouldn't have done those things.
You know, everyone has their embarrassing moments, it's not human to not have such a thing. It's pointless to keep thinking about it because no one else but you remembers. It's just a waste of time and you're beating yourself up over nothing.
But what if they do remember?
Even if they do, you're making a bigger deal out of your embarrassing moments than anyone else ever will. You should just forget about them, and remember that no one is without embarrassing moments.