16 year old kid and I think I have gynecomastia?

There is a difference in tissue or fat. A doctor can usually do a quick check to determine if this is indeed gynecomastia. This is worth seeing your doctor for, you and your doctor need to know what type of tissue this is. If you have ever used steroids, this is more likely. The real issue comes if it is breast tissue to make sure the tissue is clear of any abnormal cells. This is very important, especially since you are 16, you do not want to ignore the issue, it can potentially become larger, so have this checked, you will feel better when you have answers.