Everyone says that I am too thin but I take food as my capacity. As result, I couldn't get fat o fit... Plz help me

What are you wanting to do? Gain weight? Get fat? Gain muscle mass?

Age, gender, and are your parents thin?
Do you live in a land of parasitic diseases?
Are you vegetarian?
Do you FEEL unhealthy?

How is your weight according to normal medical charts?
How old are you, How tall, how much do you weigh?

What is your normal diet? How is your health?