"I have gynomastia and my breasts have grown from a flat chest to a size 38B in four months and are still growing. I have started loving wearing a bra. How do I get my wife to accept that I have gynomastia and enjoy it. She is in self denial and tells it is only fat tissue - which it is not."
I see two different questions here. The first is how you might be able to convince your wife that you have gynecomastia (a true medical condition), rather than just excess fat. Education is your only real option. Get her the facts on it truly existing as a medical condition from reputable medical sources, be honest with her about the factual basis for your belief that your condition IS gynecomastia and not fat, and have everything confirmed fact-to-face with your doctor. Then, give her time to process all that information and come to terms with it. Our wives are generally no more prepared mentally or emotionally for their men to have breasts than we are prepared to grow them.
The second may actually be more difficult. Getting your wife to accept (in a positive sense rather than acceptance as merely a matter of fact), your enjoyment in having breasts may likely stretch her personal understanding and views of acceptable norms. If so, that's a much more difficult issue to work through especially if your goal is her (positive) acceptance of your enjoyment in having breasts. Any attempt to try and force that issue is quite likely to backfire.
Generally speaking, I would venture that many of us are conflicted about our breasts. On one hand, we're men with all the stereotypically held conventions of what physical manhood means. That understanding doesn't include growing breasts of our own. Gynecomastia directly challenges our understanding of physical manhood and our conformity to that understanding. Why shouldn't we expect our gynecomastia to equally challenge our wives understanding of physical manhood as well? That's why it may be much easier to for her to accept your gynecomastia as a true medical condition than for her to accept that you actually enjoy your breasts. (Note that I'm not saying that you shouldn't enjoy them, just that she may not understand that.)
In my own experience, I found a certain novelty in my newly forming breasts. All the sensations were new, and as they grew larger I found wearing a bra to be much more comfortable than not wearing one. Of course, I still had to work through the I'm a guy and this is a bra, thing. You state that you've only had them for about 4-months. This is unlikely enough time for you to truly come to terms with all the changes physically and mentally and what they will mean long-term for you and for her. Give yourself time to adapt to the novelty of the new additions, and give her time to process the reality of your first question (gynecomastia or fat). I doubt that she is likely to feel very positive about your enjoying having breasts until she understands the reality of why you have them. Only then are you likely to be able to help her understand why you enjoy having breasts in a way that she will understand. Of course, you must honestly understand why you enjoy them before you can convey that to her in any meaningful way.
In the end, she may find that she can accept the fact that you have them (as a medical condition), but not be able to accept that you actually enjoy having them. Nor should you require her to. It doesn't mean that she doesn't love you and you shouldn't take it that way. It just means that she is unable to understand your enjoyment of your breasts. She may be able to work through all this in time, but I would strongly caution you against pushing it.
Anon