Hi  im 16 . i went to put in my contacts and i realised when i pulled back my top and bottom lids right where they were is yellow , i have also been noticing that when i take of my nail polish my fingernails are yellow as well . some one told me it could be an std , well im a virgin soooo no . i fee perfectly fine . not sick not light headedness no itching or dry patches of the skin ..so what wrong with me then ?