Hi My Name Is Rupinderjit Singh And I Am 19

hi My name is Rupinderjit Singh and i am 19 years old and my weight is just 114 pounds I want to increase my weight . i read everywhere that eat more calories than you burn. But i have to study full day two days in a week and work full time on other days of week so i have no time to prepare all stuff . is there any easy way to consume more calories. My other question is can my face size also increases with it because of my face i look really very small. please help me