You can be strong, even if you struggle to gain lean mass or lose fat. You have the ability to get stronger, right now regardless of where your at. Take it form me. I was 6' 2inches and a whopping 145 pounds in my early 20's. With alot of guess work and reading and watching what people do in the gym i am now a strong 180 pounds. Focusing on getting stronger will help with lean mass , fat loss and whatever goals you have. Cause stronger is better. Period.