Hello, I can understand your problem. have meals at regular intervals, don't skip meals , you can work out in gym,it increases your appetite so that you can have more , rice mainly contain carbohydrates which gives you calories , but you need protein so have chapatis in morning with pulses , one egg daily , meat and fish once in week . Make a habbit to have curd , buttermilk with meals. Good 7-8 hour sleep is very important for weight gain .