Your personal experiences are probably swamped by the fact that individuals have different personalities when speaking in different languages, due to the experiences that they've had speaking those languages. For example, it's not uncommon at all for an immigrant to have a very confident and assertive personality in their native language, compared to their personality when speaking the language of the country they live in. I know some people who are like this.
When I speak other languages I tend to be more serious. Perhaps this is because I was very serious when I was studying them? (Perhaps causation goes the other way?)
When I speak other languages I tend to be more serious. Perhaps this is because I was very serious when I was studying them? (Perhaps causation goes the other way?)