EAT. "Skinny people think they eat a lot" yemil anbebe neber. I'm also skinny ena I calculated the calories i need to get in a day. Then I eat until I reach that calorie. Lemsale I need 2,800 or more calories to gain weight so I eat until the food I eat reaches this amount. You can google calories of the foods you eat. Like 100 gram white bread is 270 calories, 1 injera beyaynet wet is 1,200 calories. So if I eat 1 bread with 2 tbsp of peanut butter and 2 injeras perday, I reach my required amount. I've gained 4 kilos in 5 weeks. The progress is slow but it's worth it. I haven't seen physical change but I believe it'll come slowly