Oddly, using a fork is something that only feels comfortable with my left hand. I can eat right handed but it feels off somehow.

On some courses that's a big advantage. I always threw left and my dad always threw right, it was interesting how the geometry of the course could tilt our fortunes.

n=1 of course, but my dad was forced to write right-handed in school (early 60's and an old-school teacher for those days). The result was more punishment as no matter how he tried, he simply couldn't (and still cannot) write very readable with his right hand. So no, I don't think practice is enough to make somebody ambidextrous. Might work for some, but certainly not for everybody.

It certainly felt real to me growing up. No matter how much teachers would insist that I use scissors right handed, I just couldn't. That being said, with enough training and descipline you can certainly overcome that. As an adult, I can use scissors in either hand but not particularly well.

I always felt like a lot of sites and apps were made to be used left handed anyway. It seems like the controls are often on the left side. Maybe it's just that I primarily used reddit and now lemmy though.

shuffle the silverware

This is a telltale sign of an American. In other regions everyone uses both hands. https://youtu.be/fypq2qhRZnI

Why :( ?

No idea. They did this thinking they were doing a good thing for me, for some reason. It was just ignorance and lack of information from them, I think.

Well, at one hand, I became ambidextrous, and got no bad side effects that I'm aware of, but on the other hand, this didn't improve anything in my life. Pun partially intended :D