When will my gynecomastia go away?

Since the age of 14 I've had gynecomastia and had it pretty bad. I've always believed that as I get older it will go away, but at 18 it's actually getting worse and worse. I'm not the slimmest person, but I've actually been steadily losing weight over the past couple of years. None of my friends suffer from it (although they are all super skinny) and I'm tired of hiding behind a big jacket wherever I go.