Your question reminds me of a couple weeks ago my 15 year old son saw me without a shirt on and said " Dad your man titties are gone! ". I must admit that I use to be so embarrassed by them. I have been feeling so good lately that I didn't even notice they had gone.
I agree with Jerry M that the chest exercises can help a lot. I do a lot of presses and incline fly's as well.
Best of luck.