When do you feel nervous? When do you feel angry?

I feel nervous when I need to tell something in front of twenty people. I feel nervous when I need to go to the dentist. I feel nervous before some exams. I feel nervous when I need to be somewhere, for example, at 8 a. m. but I'm 10 minutes late.

I feel angry when somebody took my tooth brush. I feel angry when I can't fall asleep because of the loud music. I feel angry when I'm hungry. I feel angry when I can't find one sock anywhere and the second one is in my right hand.