How to gain Weight quickly and get Muscles?

Chaolem
Hi, I have turned 17 years old but I am quite skinny and I looks like a 13-14 years old boy, I gets bully at school even at home, I have been trying to gain weight and get Muscles but whatever I eats it's not changing My height, what shall I do to put on weight quickly?
How to gain Weight quickly and get Muscles?
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