I wanna lose weight but I was anorexic?

Well morE than likely your still going through puberty since your only 15, therefore your weight will drop and rise, while you change,depending on how tall you are 125 is actually a good thing, it would actually be Normal. And did you ever think that maybe your not "fat", it could be muscle. As muscle does weigh more than fat, try talking to your doctor first to ask if its ok to exercise and lose the weight, he'll probably tell you its a normal weight for your age.but If you don't want to, then just slowly exercise at first and if you see dramatic results, like say you exercised for a couple of days and then became super skinny, then its best you stop. Plus, since you are 15 and female, all that fat in your body will go to your breasts and you butt, ithat its if it hasn't already, and breasts and your butt do weigh a lot too, look at your stomach.....if its flat your perfectly fine, if its got a tiny curve your still ok, and if its got quite a big enormous bump, then maybe you might want to lose weight, if your stomach looks chubby with a shirt on then yah, exercise a little

wft... a 15 year old is NOT supposed to weigh 100 pounds..