How do i gain more muscle?

Im 16 and currently 126 pounds. I'm very desperate in gaining some muscle, so i've been working out at a friends for the past couple months. Since then i've gained noticeably bigger pecs, arms, abs, and traps. However, i'm still really light and look really small because i have one muscle that i... show more Im 16 and currently 126 pounds. I'm very desperate in gaining some muscle, so i've been working out at a friends for the past couple months. Since then i've gained noticeably bigger pecs, arms, abs, and traps. However, i'm still really light and look really small because i have one muscle that i literally have none of: Deltoids. My shoulders are soo scrony its embarrassing. I've been doing lateral raises but i haven't been feeling any soreness after the workouts. Bodybuilders and workout buffs: help me please! Also, i have a really fast metabolism, and i consume just about 3000 calories per day and i still have trouble gaining weight. Any advice would be helpful. Thanks!
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