I want to gain muscle, im skinny. it doesn't matter how much i ate, i don't gain muscle?

Diet and muscle mass: To gain weight you have to eat more calories than burned. Do this in a healthy way though. Don't choose junk or fast food. Keep a well balanced diet and make sure you are getting all the nutrients you need. Weight lifting and other muscle building exercises can help you increase your body mass. A primary doctor can examine to confirm that male hormones appear normal. Muscle size is also genetic.