Probably nothing wrong with you at all. It is very normal for people to get 'pale' over the winter months. Also you say others have mentioned it to you - have you actually noticed a difference yourself???? Because people are idiots. I get told by different people comments in direct contradiction of something said by someone else just five minutes ealier everyday. (easiest example is in relation to how big / small my belly currently is).

How do you 'feel'? This is a much better indication of health then just being told you are 'pale'.

If you are still concerned get off the internet (and DR google) and go see a real doctor. They will take a simple blood test and check your iron levels, and they will take your blood pressure too (if it is low, it can effect you complexion).

Stop stressing girl!