Average weight?

I’m a 5’6″ female 16 year old. My weight ranges lowest 129 to 154 the highest depending how much I work out, or eat. When I was in back to back training for boxing I looked slimmer but I weighed 154. Before that I weighed from 129-134. Now I’ve taken a break for about four months since I had gotten a new job, needed volunteer hours and school got more serious. Now I weigh at average about 138. Lately I have been under a lot of stress, and as of a week ago I gotten a birth control shot. (Yet not sexually active)
Is this normal for my lifestyle, height and gender?

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