hi, I m very upset form past 2 years can't gain weight

Congratulations on your engagement! Google the term "Food Pyramid." Look at the daily nutritional requirement that applies to you. If you want to gain weight, you have to consume more calories than you are burning up. For example: If you are a regular exercising, you'd need to consume more calories to compensate for the additional energy/calories that you are burning or you will lose weight. To gain weight, look at the food groups where you can add calories without significant negative consequences. Then you are increasing your caloric intake. This is how you can gain weight. However, be sure that there is not some medical reason that is keeping you from gaining weight. If you come from a family of people who are genetically small in size/frame, consider that and try to find ways to improve your self image. We are all special in our own way. That means you too. Take care and please keep us updated.