My native language is Finnish, and I’ve never been able to pronounce R correctly in it. I have what they call “a French R”, meaning I pronounce my R’s in my throat. I went to speech therapy for rhotacism (screw whoever invented that word) for a year when I was around 7, and never learned it. Eventually they just kind of gave up.
The Finnish R and Japanese R are usually said to be identical, which is mostly true, but the difference I’ve noticed is that typically the Japanese R is shorter and it doesn’t need to vibrate as strongly. If you think of the R that you’ll hear when a Japanese person tries to sound more agressive, like a yakuza or a generic tough guy, that’s basically what the Finnish R sounds like.
Thing is, since I’ve watched anime from a young age I at some point noticed I could pronounce the shorter Japanese R sound correctly, although sometimes I’d get rusty and would have to re-learn it. I was still never able to imitate the tough guy speech, but I was okay with that, it’s not like it’d be very useful to me.
But then we get to today. I was on my way home, singing Hunter x Hunter’s op, Departure. The last line of the TV sized version goes ”何度けど立ち上がれ!“, and the singer rolls his R as he stretches out the last word. I was singing along, at one point I noticed I also tried to make the rolling sound in my throat, and just thought “yeah I really shouldn’t do that or it’ll become a bad habit. I’ll just do the R as I normally do”. And so, I sing the song again, and as I approach the end I remind myself to just do the R the normal way without doing anything weird. Welp, I didn’t, because for the first time in my entire life, my R rolled the correct way. I obviously got super excited, tried saying a bunch of Japanese words with R, and a couple in my native language, but the latter felt a little clunky as I’m so used to the way I do it.
So now, at the ripe age of 18 years old, I can FINALLY stop being jealous of English speakers who easily learned to roll their R when I as a native Finnish speaker couldn’t. ありがとうございます、日本語さん🤝