i need your advises badly...

try to eat more than you had, like triple the amount of food you usually eat but stay fit. A little exercise will do. Think positive and look at the bright side. Good luck!!!

This discussion is different. I have to ask, why do you want a chubby body? It's just kind of interesting that while most people want to loose weight you want to gain it. First off, it has been shown that it can be hereditary, if your parents, siblings, grand-parents were all 'thin' people, than odds are you will be too. If that is not the case, then just sit around and eat, that will do it over time.