When i first started training 11 years ago, you would describe me as a chunky kid. I indeed had a fatty chest that resembled breasts, not gyno. I know that cause long story short, I did have actual gyno 5 yrs later. Your problem is most likly due to you storing fat in your chest, not gyno. Especially if your not experiencing and pain or mass in the nipple area. The answer...be consistant with your diet and CV. In time you will lose fat in that area and your chest will have a more masculin shape. Resistance training of course will help to shape your pecs. But if you not burning, you might as well look forward to wearing a bra

...just kidding. You can do it... I did! take a look