Does language define our identity?

In many ways language defines our identity. In my opinion this is more evident when looking at an individual rather than a group of people. Many people opinions including my own are shaped by the way someone talks and the language the use. I noticed this when i met a man over break. He talked very properly and used large words. This made me think he was smart. He also talked in a very monotone voice which made me think that he probably isn't that fun to hang out with because he doesn't get excited very easily. Because of the way he talked, his identity to me was decided very quickly. Also, a persons race which is part of their identity can be determined by the way a person talks. If they have a British accent, they will be identified with Britain. These two examples make it clear that language can define an identity.