Gyms are full of skinny guys trying to build muscle. And yes, I know what it's like to be skinny. But you don't have to be skinny forever. Train hard, three times a week. Lift as heavy as you can with good form. Be sure to have rest days to allow your muscles to recover so you can build bigger muscles. Start swapping out the garbage calories for more nutrient-dense foods and you will be amazed at how fast you build muscle. You need to realize that the degree of muscle growth you desire is likely achievable through nothing more than hard work and dedication. It really is. Just ask this skinny guy.