Hello, My Name Is Ashley. Im About To Turn 19

Hello, my name is ashley. Im about to turn 19 and i have a fast metabolism, im 4"11 and i am supposed to weigh about 95 or more pounds. Ive never had an issue staying in this weight zone, until a month ago. Now i weigh 81 pounds. Im eating regularly even more then i used too. But i just keep losing weight. Im getting scared that i will continue to drop and i dont know what i should do... Please get back woth me. Im very worried abiut my health