I am 14...?

a girl who is 5'6 should weight between 118-155 lbs. There is a big range because it takes frame size into account. If you have a small frame, you should be on the lighter end...a large one...the heavier end. You are underweight, but if you are eating normally and you feel OK, I wouldn't worry too much about it. You are still young, you'd be surprised how your metabolism changes when you get older. You will probably have put weight on by the time you are in your 20s.