I am facing a serious problem with my group of friends. For some reason, many of them have started speaking in a really rude way when we are out, usually when we are sitting having a coffee next to a group of strangers. They swear and shout at each other, and the people next to us turn round and look at us, shocked at what they hear. I feel extremely embarrassed and turn bright red. I am very worried that one of the people will know who I am and tell my parents about it. I have been friends with these girls for many years and don’t want to lose their friendship, but every time we go out now I am afraid of what they will do and how they will speak! What can I do? Please give me some advice to help me solve this problem.