Unusual professions

Today, when I was studying for my upcoming math test I started to feel a little bit stressed. I hate this feeling because it makes me feel distracted and overwhelmed.  I started to reflect what does this emotion do with people's mood and what does it make them do. When I'm stressed I can't focus on anything, I stop believe in myself and I don't want to talk to anybody because I need to calm myself down which is sometimes very hard. On the other hand, when my friend is stressed, he is rude to everybody and he is arguing about everything. He is sometimes hard to stand but this is what stress does to him. This emotion doesn't have positive influence on people and it can prone to bad situations such as failing a test and sometimes it can also ruin your relation with others.