How much should I weigh?

I am a 15 year old girl, 5' tall, and I weigh 84-85 lb. I am rather active. Would you consider jogging and walking on the treadmill 30 minutes a day/4-6x a week active? Plus, dancing 3 hours a week? And how many calories should I eat per day? I also lift 5 lb weights every other day. About 50 repetitions of each weight exercise and 75 crunches. Also, about 20 pushups along with these exercises. I eat very healthy. I eat approximately lots of fresh fruit and veggies, whole grain, etc And I also drink lots of water. Is drinking coffee bad for me? I only have red meat maybe once a week (sometimes I don't even have it every week), but every other night I eat ground turkey, chicken, or turkey sausage.