The upper part of my chest does not have much fat but the bottom does i don’t know if its fat or if its Gynecomastia.
Physical exam would be needed to assess the area as it is difficult to tell if there is any gynecomastia in the pictures.
As per your photos you do not seem to have any irregularities or signs of gynecomastia to be worried about. However, gynecomastia cannot be confirmed simply by looking at photos. If you are truly bothered with the way you look and feel I suggest you consult with a board certified plastic with whom you can schedule an in person examination. Best of Luck to you!