I speak Indonesian and Javanese as my native language, "forced to learn" Japanese, English, Malay, and a bit of Chinese here in Japan. Contrary to common opinion, I regret that I learn and speak a lot of languages because I don't feel adequate enough in any of them, even my native language. Being able to use a lot of language really broaden your view, but at the same time, you will incline to develop multiple personalities/conscious in your effort to speak like the native. I find it difficult to express myself in a "constant" way regardless languages, hence the feeling of inadequate.