How come my nipples seem underdeveloped and my chest muscles aren't very big? What could be the reason?

Patient's question:

Main symptoms: Chest has not developed, Onset time: Did not pay attention before, Test results: Have not seen

Doctor's answer:

This is because body conditions vary from person to person, such as body fat, height, whether one enjoys exercise, and genetics are closely linked.
Since you are male, your nipples do not need to be well-developed, nor should they be very prominent. The lack of significant pectoral muscles may be related to your usual disinterest in exercise and fitness. Generally, people who enjoy physical exercise tend to have well-developed pectoral muscles. Perhaps you are very slim, so your muscles are relatively small. Additionally, your genetic makeup may also determine that your breasts are not large and your pectoral muscles are small.
You can start to strengthen your physical exercise now, such as weightlifting to expand your pectoral muscles, which should bring about some changes.