As long as the person you are talking or writing to is aware that you're not a native speaker, they will understand that you won't be able to follow conventions

As long as the person you are talking or writing to is aware that you're not a native speaker, they will understand that you won't be able to follow conventions around polite languages or understand subtle nuances on their part. It's really a non issue. The finer clues of language are intended for people who are from the same culture.