I think something is wrong?

I am 14 years old and I weigh around 93 pounds, but I normally eat like crazy. Like I eat a lot, lol. I am always doing some sort of physical activity. But suddenly this past week I have not been eating much at all and I have been so so tired. And I just don't feel like myself and I've been kinda upset for no reason and it's not my period because it ended almost two weeks ago. I just have a feeling that something isn't right. Please help (: