Surgery dude.
I've not discovered this website till I was 34, consider urself lucky. Go for it, get the moobs out of ur life, and diet at ur ease. what the hell, even if u stayed overweight, u'll just be "another" big guy.
Again, its obvious, surgery. Just choose a good doctor.
P.S. I guess I read here somewhere that 3 out 5 men have some degree of gyn, ur not alone, we're all in this.