I'm not as lean as alot of guys. I always use a 1.5 inch, 21 gauge. The 21 gauge is like a pencil, but i switched to 1.5 inch cuz when I used a 1 inch, the oil would just collect between the skin and the muscle and create very painful pockets of oil. It does hurt, and once i injected too low and the muscle started spasming. I can't do shoulders, too painful, same as quads so i have no choice but to use glutes. I'm really screwed now that I'm starting tren ace .alot of pins. So, count yourself lucky that your not sore!! 8)