Gynaecomastia
Thank you for the photos. In some cases gynecomastia will resolve on its own in early adulthood. In most cases it won't. If it doesn't resolve, the surgery to remove it is safe and effective. Be sure to see a board certified plastic surgeon for the best possible outcome.
So it looks like you will need surgery to correct this gynecomastia. However, you should first be seen to be sure there is no other underlying cause for the condition other than having gone through puberty. The surgery will be the best option.