Agree with you on code-switching, it's very common. Not sure what you mean on personal identity, but non-native speakers are often afraid to betray themselves,

Agree with you on code-switching, it's very common. Not sure what you mean on personal identity, but non-native speakers are often afraid to betray themselves, consciously or not. They don't realize that they could soften their accent without completely getting rid of it, so that people can understand them but still tell where they're from.