| You may just not be noticing the change yourself as it's so gradual. Try asking someone else's opinion who sees you a lot, or try taking photos at regular intervals in your training.
It's kind of like how anorexic people look in the mirror and see themselves as fat bu the opposite...in this case it's you were skinny and used to seeing a skinny guy, then with the gradual change you don't really notice it 'till you look back at how you were at the start. Probably why everyone's never satisfied...
However, it may be that there's something wrong with the workout, or you're not eating enough or one of many other things. | 
