To change my whole posture etc when I speak a different language

[Hoppinggreen]

So I speak 2 other European languages and am learning a 3rd and I have noticed that my tone and body language/posture change depending on which one I speak
Spanish - my voice drops lower and I tend to be a bit more feisty , louder and gesticulate more
French - I kind of slump a bit and use my shoulders a lot and also my eyebrows
German - I sit up straighter and am a bit more formal

I had no idea I was doing any of this until DH took the piss but now he has I notice it. Does anyone else do this or something similar? It’s almost like I assume a character.
Also I tend to use Spanish to bollock the DC and German to issue commands to the dog

I'm much more assertive in french, it's bizarre

There is science behind it! Proxemics and kinesics..
There is a superb fantasy novel by Janet Kagan, Hellspark, which really illustrates the concept.

"I'm much more assertive in french, it's bizarre"

It's not really bizarre. "Language" is more than just the words spoken and the grammar - there is a cultural aspect as well.

In some languages there is a cultural reluctance to be too assertive, with lots of wandering about trying not to sound too direct or critical. In some other languages, this would be considered "waffle" and the message and impact would be lost because the culture is to be more direct (which, for example, to an English speaker might sound rude or abrupt).

I go passive aggressive tiger mum in Spanish

Hopefully, when you go to France, Spain and Germany, they don't think you are taking the piss out of them. It may well look and sound like it.

I’m the same, to me switching between languages is like putting on a different dress and it appeals to the closet actress in me 😂

I also have different Englishes, depending who I’m addressing. Other than my normal English I have European English with different words and tone when addressing European colleagues, and full on Downton Abbey when talking to Americans. I really can’t help it. Maybe it’s to avoid slipping into faux American and possibly offending them, so I go completely the other way.

my DD is bilingual and I’ve noticed recently that when she speaks English she out Britishes her British relatives. Local language she just sounds bored.

I'm a native speaker of English. Dutch is my second language and I also speak fluent French (I live in France).

I'm a lovely person in French! I'm smiley and friendly and relaxed. I'm the best version of me.

I can be quite stroppy in English. I sag inwardly when I set foot on UK soil because I know stuff is going to wind me up several times a day and I'm going to rise to the bait and end up dithering: do I say something or do I end up being wet and ineffectual so I don't offend people?

But the flip side is I love the no-nonsense side (bolshie) side of me that comes out when I speak Dutch. Sentences are short and to the point. English waffling be gone - I'll tell it to you straight. I don't think I'm being rude...

This is my experience too, as a speaker of two Slavic languages. I ‘soften’ when I speak English, and yes, smile more.

It's normal. I have completely different tone and demeaner in English than in my native language. Apparently it makes me 5 years younger based on higher voice and such😂
In my native i am good half an octave lower

No, it’s not that overt.
If you didn’t know me you wouldn’t notice.