Im 13 and 135 pounds!! help?

I am 13, I weigh 135 pounds and I feel terrible. My height is 5'4. I have a little man boobs which I have seen have actually been deflating but I still want them gone. I am more wide than thick, and my exercise consists of running at least half a mile a day because that is our warm up in P.E, then after we play a sport for like 20 minutes. I have tried hard, I eat about 1800 calories a day, I don't drink anything else than water but i only drink 1-3 cups a day because I am never thirsty. Can u plz help.