Going according to the pictures it does not look like gynaecomastia. But you need to be examined to confirm. Nipple will vary from person to person, different shapes and sizes are common. Also the fat on your chest can be reduced by exercise. Weights are supposed to help. You will notice result within 6-8 weeks. Despite all these, if you are still not satisfied there is a reduction surgery done by plastic surgeons which some young men undergo.