To begin, mature! Apparently you sabotage yourself by saying that "you are less", how do you rate yourself? Do not you deserve to live? Did you do something wrong? Do not be silly, accept and confront little by little. I know it's difficult, but it all depends on you, if you get upset about people sneezing and coughing the PATM will be worse, you just have to accept the condition and every time they sneeze they cough up a little towards them, if someone talks to you and then he looks at you with an angry face, you, you just have to be relaxed and confident with a smile on your face, you have to face it, it's the only way to diminish the PATM effect. I repeat, I know it's difficult, but you do not have another one, unless you want to commit suicide.
If you cough up your classroom coughing, just take courage to ask a minute of dialogue to the teacher and go to your classmates asking them if they feel any smell or something, as questions on the street, ...... ...
Where are you from?