i got gyno as a teen also, you couldn't tell now, but when i was 14 i got mad lumps under my nipples, my father said he got the same thing, took about 18 months to regress, it was so bad, becasue i was in state titles for swimming every year leading upto then... we always had a pool in the backyard, and having an older brother and sister there was plenty of competition.
even used to race underwater laps. ive done 3 laps of a 15 metre pool. 7 of a conventional. insane with flippers lol.