I felt like that in high school. Truth is, do you look at everyone and mock them in your head? Do you obsess over other people's appearance and judge them? Especially people you don't even know? Do you waste your time thinking about other people's flaws? Probably not, so don't worry, most others don't either. Truth is, these are the feelings you have about yourself and you are allowing yourself to believe everyone else is thinking that too. Trust me, those people have a lot else on their minds and some of them may be wondering if you are looking at them and mocking them!