I'm eating alot but i still very thin what shall i do?

Metabolism: The rate at which we burn calories is faster for some folks than others. It gradually slows down as we get older. Please see your doc for a check up to make sure you are otherwise healthy and then enjoy good food. Focus on being neat, clean, and treat others the way you would like to be treated. That is more important than weight in most folks eyes. Peace and good health.