Can you guys suggest a diet plan for skinny guys?

The body seems to have a body weigh "stat" that makes it difficult for some to gain weight and for others to lose it. There are a number of diseases that can keep one from gaining weight and make you "skinny" . And this differs depending on your family history and ethnicity. Best to ask someone in the Maldives what works. In general the lower ones BMI the longer you live.

Please see your doc to make sure there is no medical condition causing this. If that's ruled out, then a nutritionist can help. Appropriate exercise can help strengthen muscles and create a bit more bulk. Above all, like yourself the way you are. That's much more appealing to others than some extra pounds. Peace and good health.