Why are they so insensitive?What can I do?

I'm feeling real depressed again. I swear its like when I'm at home I'm fine sometimes more than fine, just pure elated but when I go out into the world at school or out any where in public I internally cringe. I try to look indifferent when people look at me, scrutinzing me and accusing but inside I feel incredibly horrible. Why are they so insensitive. I know that I'm not pleseant to look at and yeah even painful to look at but I already know how I look. No need to remind me. This just really bothers me and I sometimes leave when i overhear people talking about me or when they say it while I'm walking past by them. I'm in grade 12 and I cannot afford to keep on cutting school. What can I do? I'm already talking to a counselor but I just can't seem to tell her everyone on my mind and heart.