Well first I'll introduce myself, as this is my first post on this forum

I'm 16, 5'4 115lbs

Skinny, huh? I've been lifting for about 7 months now and put it this way, when I try to use a body fat percentage device, it comes up with an error.

I'm still growing in height, as I got X-rayed for a shoulder-related problem that is a whole other conversation, and my growth plates are still obvious.

My BMI is 19.1, which is pretty low I'm told from a former Mr. Universe who works at the gym I go to.

Either way, I eat more than most of my bigger friends, and take a Whey Protein supplment called Amplify, 1 1/2 whole scoops after I work out.

I guess what I'm trying to ask is what should I eat to put on some muscle faster?

Here's a picture of myself from about a month ago: