Have to second the idea that you are too young to run anything hormonal. I think most of you young bucks would be extremely surprised with your gains if you got your diet, basic nutritional supplementation, and of course your basic helpers such as creatine perfected. At that point these hormonal products will do 100 X more for you also. However, I do understand - I started too young as well, and have been blessed that thus far no long term harm seemed to befall me. Not everyone is that lucky though...just be careful.
I have never "felt" this class of hormonal products quite as early as you are speaking of. I did a little run of 4-Andro to see how it would fit into a stack and around the end of week 2 I still wasn't "feeling" any different. However, I ramped up my calories at the beginning and at that point I was definitely leaning out. If you stick with it, give it another week or even two. Generally the pump starts getting better at that point IME. I have to say that MANDRO is one of the best out there for the price. I wouldn't be worried about having a bunk bottle......patience and hard work. I have been trying this class of muscle builders for more than 15 years - don't claim to be an expert by any stretch - Definitely a lot of trial and ERROR under my belt though.