How can I stop feeling uncomfortable when interacting with foreign staff?

See Japanese discussion here ｜ 日本語でのディスカッションはこちらです :

https://www.j-globalbizschool.com/forum/konhuidensuwomotuteintanasiyonarukomiyunikesiyon/nabasuninarazunigurobarunasutatuhutohanasu?origin=business_manager