Gluten free just means that you don't eat a lot of gluten foods, like pizza dough, and since wheat is so common our diet, it is probably smart to reduce your gluten. (And important if you have a medical issue with it, like celiac disease.)
But weight is a function of calories in and calories out.
You might actually be totally healthy at your weight. If you are training and have muscle, and/or your bones are relatively thickly built, you can weight more than average but be in great condition.
Can you pinch an inch of fat around your middle? That's how you know if you're getting too many calories.
Don't go on diets, they usually result in rebound weight gain. If you must lose, lose things that you don't mind losing. The easiest thing to get rid of are high calorie beverages. You don't have to sweeten your tea or coffee, and water is the best hydration as well as being free. Juice and pop are ok once in a while but you have to consider them as dessert because they don't really add much nutrition for the calorie hit you take.