Trying to gain muscle mass

I’m 5”8 and 125 pounds, 14 years old. I’m pretty skinny but I do have some nice muscle tone, I have abs, my chest is starting to come in, and I have really good biceps. Most of my muscle isn’t for show, I’m pretty strong and I’m stronger than some people who are bigger than me. Still I’m sick of getting called skinny and scrawny and i’m wondering how I can gain weight without any equipment? Can you use solely calisthenics and a high calorie diet?
What foods should I eat? Also i’m just starting highschool so is it likely i’ll naturally fill out with puberty?

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