Help!!!!!!!!!!!!!!! Getting Bigger by the minute??? plz girls/women only or really helpful men. No smart alecs

I like to eat. I dont over eat, or at least i dont think i do. I excercise at least 2 days a week for about 25 min. I am getting fat and i dont like it! Im 12 going on 13 and i weigh 98 lbs. Is this normal? (I havent had my period yet but i get discarge??) {If that last part matters lol}