Hey, so I am only 15 years old, I've been working out for 5 months, and I have lost about 75 pounds of body fat since march 2011. I've build some muscle in my chest, but the lower part tends to keep some fat. At least this is what I trought. I've done some research and think I have gynocomastia because when I flex my chest, my nipples kinda go to the opposite side a bit. Do you think I have gynocomastia or is it just body fat that I need to get rid of ? Also I weight 153 pounds, and I've calculated my BF online and it's about 15%. Posted some pictures below