Verified answer

Depends on how tall you are..

Try this website, http://fit.webmd.com/teen/bmi/calc-bmi

put in your height, and for weight put 91 lbs. (That's 6 & 1/2 stone)

I have the same problem though, (I am 94 lbs.. and am 17 :P But I am 5 feet 2 & 1/2 in.)

my legs are big-ish and my hip bones pop out :p

I haven't stopped my period though, so that's a very bad sign :/

Try the BMI calculator and it will tell you if you are underweight, if you have problem gaining weight or a bad relationship with food talk to your physician.

You are not that under weight for 13 year old. But your most desirable weight would be near about 8 stones or 112 pounds. It also depends upon you height also. If you are 5 feet in height, you are not under weight.Normally a 5 feet female of 13 year old should be 100 pounds or more and for every inch height add 3 pounds of weight or in case of lower heights deduct 3 pounds for every inch of height. So, calculate yourself. You should not get worried about it at all, as in our puberty we grow faster than we can eat or metabolize. So, as we grow older we tend to gain more weight.

yeah boo bear. eat some pickles, that'll help

YES A BIT