Im obsessed with losing weight?

Im naturally skinny. Im 13 years old. And im 98 pounds. Im also very tall. But i have this weird obsession with losing weight. Could I be anorexic? I also have a boyfriend is this really unnatractive to him. I mean im skinny but for some reason i have big boobs. Im also going to start running everyday. Could this be unhealthy?
Im obsessed with losing weight?
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