A friend of mine is a foul-mouthed dirty scoundrel when he speaks Portuguese with Brazilian friends (where he grew up for half his childhood), a normally-swearing Texan cowboy when he speaks with American friends (where he went to college), and a swear-words-have-never-touched-my-lips gentleman when he speaks received pronunciation with his British friends (other half of childhood in London).
He's the same person... but entirely different people.
Another anecdote, when I taught English in Brazil, I had one adult student, a lawyer, who was entirely serious and down-to-business with a deeper voice when speaking her native Portuguese, but in English she spoke like a little girl, at a much higher pitch, and a much sunnier personality.
But on the other hand, another very multi-lingual friend of mine is exactly the same person in every language -- same attitude, same swearing, same everything.
So not sure what it says about your personality... or personalities... :)