I have gynecomastia and my penis & testicles are very small. Could it be genetic?

It is quite possible that you have a hormone problem that is causing all of these issues. It is unlikely that cycling caused your penis and testicles to be small. The place to start in finding a diagnosis is to have your family physician examine you and order some bloodwork to assess your hormone levels, specifically your testosterone and estrogen levels. If those are abnormal then you will want to see an endocrinologist for further treatment. Once you get a diagnosis as to the cause then you can proceed with surgery to reduce the size of your breasts. Make sure to use a board-certified plastic surgeon when you do. Hope that helps! 

It looks like you may have a syndrome that include small testis and gynecomastia. How should I choose a surgeon?Choose carefully. The decision is yours. Advice to assist in making your selection.1. Experience matters. Choosing a surgeon increases the likelihood that they have seen a case similar to yours in the past. Selecting a surgeon whose practice is focused on gynecomastia exclusively is also an indicator of experience.2. Results matter. The more before-and-after pictures, the better. Pay attention whether the surgeon is confident enough to show multiple angles of the same patient.3.Only gynecomastia Reviews matter. 4. Expertise matters. Is your surgeon recognized by the profession as an authority in the field? Have they authored books or medical journal articles regarding your surgery?Be realistic about your expectations. Also, revision surgery tends to be significantly more difficult than initial surgery.