They have problems and worries too...dont think about it
During lunch I try to find a place with nobody there and I draw, read, or do homework. I'm always alone and I don't mind, but I am self conscious if someone is looking at me, because I think they are judging. How can I quit worrying so much?
Do not worry about what others think of you. First, you become non-judgemental yourself and see the difference. Others may be as vulnerable as you are.