As a former skinny dude you need to lose the “my metabolism is too fast” mentality and actually track your calories to grow. You are simply not eating enough

10

def need to eat more, working out isn’t gonna help you if you’re not eating enough to actually put on muscle size

10

Fast metabolism is almost entirely a myth unless u have hyperthyroidism which I can almost guarantee u don’t. U just gotta track ur macros and make sure ur eating in a surplus and you’ll grow u can’t break the laws of thermodynamics

5

Eat 4 meals a day and eat them fast

2

About the food, learn to cook. I know some guys that say "but I eat so much" but it's all frozen junk food. Some ppl can eat that and the calories don't affect them so if it's you then you gotta cook and eat real nutritious stuff for your body to hold onto it

2