Is 145 pound overweight for an 11-year-old girl who is 4 feet and 10 inches tall?

According to your BMI (Body Mass Indicator), if you weighed 145 pounds then you wouldn't be overweight anymore.

Other factors must be taken into account, such as male/female, and height for an accurate measurement of your BMI. Have your parents contact a doctor if you or they feel you might have a problem. It is better to be aware of it now and try to change your eating habits than it is to hold off and get worse.