Gain weight

Veeky Forums I need fucking help
>190cm
>66~67kg
>skelly as fuck
>I get some pussy, but I can't look at myself in the mirror and I don't understand how my gfs used to do

I eat trash all the time but I am not gaining any weight, the more I eat the more I shit it all out
>diarrhea all the time
>doctor told me I have faster metabolism, whatever that means

How to overcome this ? I know I have to "eat more" but that doesn't work at all. Is there some Veeky Forums tricks, what kind of food should I eat, ? This is my first time on Veeky Forums and I don't know what any of those weird words mean ("eat more carbohydrosomethingates" )
+I am not trying to get ripped, I just want to look regular

HELP A SKELLY OUT

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Eat at least 4000 kcal
If you dont gain any weight
Kys

GOMAD

G O M A D
O
M
A
D

Drink your food

smoothies, weight gainer shakes

How in the ever loving fuck do you weigh 67kgs? How the fuck is that possible above 13 years old? The fuck do you eat?

Drink a gallon of milk a day. Go Mad. GOMAD.

You will gain weight, gain testosterone, and gain muscle.

If you're lactose intolerant? Do it anyways. Your body will adjust. That's how asians can drink milk in America.

EAT MORE PROTEIN

LIFT

READ FUGIN STICKY

What it means to eat 4000kcal, how much is that ?

Today I had around 250grams of chicken breasts, 4 hotdogs, half a bread, and around 250ml of milk
How much is that in Kcal ?

Track your macros brah