I was 5'9", 145lbs in my h.s freshman year. I went out for FB and made the team. Then came the weight room. Fast forward to my senior year. 5'10", 215 lbs, rock solid muscle!
I continued to work out until I joined the ARMY. I opted for the Infantry. 5'10" 225 lbs, more rock solid. Then I met my DI's!
"Boy, we catch you touching any kind of fitness equipment we are going to run you until your grandkids feel it!" In 11 weeks I went from 225 lbs to 180 lbs of lean,mean, fighting machine!
If you want muscle and mass lift HEAVY and A LOT! Do so many reps with as much weight as humanly possible, then add more weight and reps! That's how I did it. I was not on any special diet, besides the McDonalds diet.
I'm now 48, 5'9" (how did I get shorter?) 245 lbs, and still in alright shape. Oh, and disabled.