I'm a PhD student in molecular biology, English is my native language, and I also can speak German although it needs some practice. Currently I'm learning Russian and I am quite interested in their culture and history. Same goes for Ukraine and Ukrainian, and I have actually visited Ukraine twice, it was a really nice experience.
I'm very open and communicative, so I reply to emails regularly and correct what people have written, I'm not lazy in this respect. I think having conversations with real people in real situations is very beneficial while learning a new language.