I am a 13 year old girl weigh around 86-87 pounds and is that average or overweight?

The average weight for a 13-year-old girl is between 75 and 140 pounds, so your weight is within the average range. However, it's important to remember that everyone's body is different and there is no "ideal" weight. The most important thing is to be healthy and active. If you are concerned about your weight, talk to your doctor.