Hello there and congratulations on acting in a play! How exciting for you!
Losing weight is a game of patience. Our bodies gets used to the weight we currently are at and fights to lose weight, which is why it usually takes time to lose weight. A healthy weight loss can be 0.5 lb to 2 lbs/week. This page from an older question on losing weight may give you some ideas on how to lose weight eating a balanced diet.