Bro its nothing to be embarrassed about, man boobs can be because of two reasons either genetics or because of chest fat, it can be reduced easily over a period of time by reducing your body weight and u need to go gym and do weight training and control on your diet if you r fat, if it’s genetic and you are not fat then do heavy weight lifting of chest exercises and over a period of time your problem will be resolved but it will take time and patience. Its nothing to be ashamed trust me 1 out of 4 person have man boobs and its common and this problem can be solved easily with time