I have a problem when I have to greet someone in real life. In school I usually raise my hand as a greeting, but on the street it is so much troubling. Today I saw my close friend (well we have only known each other for a few months since it's my first year in highschool) and couldn't say hi. It is so embarrassing because we don't know each other that well.... I'm in constant panic and have a severe anxiety... Like I don't know what to do, my voice shakes, my hands shake as I'm typing this, my throat can't get relaxed...