Reason for loosing weight//How you chose a goal weight??

Hey, I just joined CC. I'm wondering how you all chose your goal weight. First off, I'm 5'6" and have a small frame. Right now I'm 120 lbs. I used to train rhythmic gymnastics for 2 hrs 4 times a week.(3 mo. Ago) I was 120, but with long muscles. I set my goal to 108 and I'm starting training again. Is this to low? Because at 15 yrs. I could be 102 and not be under weight. I'm wondering if my sporting has messed up my idea of a healthy weight.

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