How can I gain weight with out having to eat junk and be healthy

ok im wondering if theres a way I can gain weight....I've been trying for along time and nothing seems to work and I was wondering if there is some safe way of doin it with out harming my body with junk. reason why I want to knoe is because well I think im to under weight for my age...im 19 , weighing between 105-110 , and the height of 5'5-5'4 ....I dont even noe if tats the proper weight for my body type....I eat a lot ....a lot more then pple I noe who weighs 120 130 and I cant seem to gain a pound ? give me some advice please ...and according to the BMI I am under weight please help

There are mass-building products at your GNC. I hear that Muscle-Tech works the best.

Greetings,
-Ok you should only gain weight by eating grain type foods, not fatty foods. Use the food pyramid.
-phil2611