Honey, I'm afraid you are WAY underweight. Try out for sports, eat a bit more, etc.
I won't accuse you of being anorexic, because some people are just naturally very underweight. You could just have a slow metabolism or a tall and slender body type, but either way, you need to gain some weight.
The average for a 14 year old female at 5'7" should be somewhere around... 120 or 130? Possibly more, but I am by no means an expert. Your BMI (Body Mass Index- http://www.nhlbisupport.com/bmi/) is 14.6, which is WAY below the average line (18.5- 24.9.)
Practice eating a balanced diet including fat as well. many people fail to realize that the reason fats and oils are part of the food pyramid is because you NEED them, even if you don't need much. Also, get about an hour of physical activity in per day to give you some muscle.
Good luck, and... GAIN SOME WEIGHT >:O