Im 12 and 97 lbs am i fat?

The average weight for a twelve year old girl usually anywhere from 100-120 lbs. And the average weight of a fifteen year old girl is 110-135 lbs. That seems to be the category where you fall. Although you are very tall for your age especially, I do recommend eating healthy and maintaining a simple exercise program to prevent becoming over weight. Try exercising anywhere from 15-30 minutes EVERY day; easy things anywhere from jumping rope, or playing a sport to jogging/running/walking etc.