Hey there -- Lighten up!
I spent the first 10 years knitting AND purling through the back loop. Yep, my stitches were twisted. But otherwise, all my projects functioned and looked really nice, just like I'd intended. And people liked them just as well.
taught others to knit/purl like that.
But no matter. No harm done! Like I said, only another knitter would know to spot this goof.
It's like any other mistake in knitting [or any other craft]: just learn from your mistake, correct it so you don't do it any more - and move on! Beating yourself up NEVER is good.
NEVER BEAT ON YOURSELF!
You likely are self-taught, right? So pat yourself on the back and BE PROUD that you've mastered - yes, MASTERED! - an ancient craft.