I am 18 years old. Does my right side of chest have gyno or both? Also my nipple on the right and left is different

It looks like you have gynecomastia on both sides. It might improve with some weight loss but if not you will need surgery. Your skin looks to be in good shape so I would think you would get a great result. Good luck.

Thank you for sharing your excellent question and photographs.  It appears that you do have 2-sided gynecomastia which can be taken care of with surgery, typically a combination of liposuction and glandular excision.  See an ASPS board certified plastic surgeon in consultation to discuss, they can offer you the best advice.