Dude at 16..... REALLY? That lean muscle your working hard for now will pay off 10 x's over as you mature and your body will add mass naturally,
Keep up the basic movements, keep track of and monitor each and every workout to add more and more weight... and watch man!
Eat like a mad man while you can, but be sure to get your protein and carbs in the right ratio, and man the sky is the limit.
P.S. never lose track of hitting your wheels like you have, too many of us older farts,(me!) forget that legs count too!
Keep rocking man!