First of all gynecomastia is the term used to describe male breast enlargement. If your a male and have breast enlargement you then have gynecomastia! It does not mater if it is mostly fat or breast tissue.
Everyone, male and female are born with breast tissue. In your case you look like you have a mild case of gynecomastia, if it has mostly breast tissue it would require surgery to remove.
Hope this helps.
Bob