Have you ever heard of accutane?
People saying that "wow your skin looks great today!" are trying to make boost your confidence, but because they don't know how you feel, it's actually doing the opposite. Unless they are being sarcastic, I think they are trying to have good intentions.
I don't really know what to say since I haven't had much acne before, but I know it can be painful.
Just try to keep your head held high.
"Even a broken clock is right twice a day."