Language is a very important concept and always has been, it is the medium communication since the beginning of time, how we express ourselves.
Usually, people who are born on a certain place and in a certain society tend to talk and express themselves like the people around them. This skills (language and communication) develop over time and people adapt to the place you live. Of course, other factors adapt to the way we speak but mostly we all learn from what we hear and who we hear it from. Also, a place is identified by their language, people from that place speak the same and with the same accent, so general languages are labeled among a country.
Now, how does speaking any language can affect my identity or my culture? When you enter a country or hear people from a different community or society you can tell that people may speak the same language but different accent or vocabulary (some people even make up words), so that is when people identify a certain group. This can turn out being negative or positive, negative because then people would be stereotyped or mocked at. Positive because you can learn different cultures and be influenced by them.
So, in conclusion, when someone speaks a certain accent or language, they still communicate, and they still say whatever they have to say. But the thing here is, people identify other people through language and you can also link it to their culture. We learn from each other and we express ourselves the way we feel most comfortable. But we need to accept people’s diversities and do not discriminate.