Teenage weight loss

I'm 16, 5 feet tall, VERY SEDENTARY (yes, ik i have to start exercising), 91 lbs, and eat 1,300 calories a day. Every day, at 9:00, I get really hungry but have no more calories left over.. advice?

I am really short + non active so I think I already eat wayy too many calories. I also have a slow metabolism i think, im not sure though

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