Is there something wrong with me?

I constantly feel so unattractive to the point where when i walk down a corridor i feel like people are constantly laughing and talking about me. If i'm talking to someone, i try as much as i can to cover my face up and feel really uncomfortable in light places. I constantly have a feeling of anxiety and have a strong fear of social situations involving strangers. I always feel upset and on the rare occasion when im happy, find myself searching for reasons not to be :S Is this extensive vanity, or does anyone think there may be a reason for it? Help would be much appreciated :)