I am 14 yrs old and my height is 5'4.5". my weight is 108 lbs (49 kgs). am i underweight?

find a site- theyre easy to find- that will calculate you B.M.I. - that stands for body m index ....... make sure u find one that differentiates between male and female. it goes by both your height and weight. if u are under 18, means u are underweight.