As for the problem that the pectoral muscles are too big, I think it can be improved. First of all, what you should do is to exercise. You can often do push-ups or running, and you can also do some other exercises to make your body better. As long as you keep exercising every day, I believe you will eventually change your figure, just like one of my cousins, who used to be bloated. As a result, he didn't look good in any clothes and felt inferior at that time, but later he decided to lose weight and insist on exercising every day. After a while, his clothes really look much better than before, so I think you can also improve your physical deficiency through exercise.
Furthermore, you can also improve your chest muscles by choosing the right clothes. As long as you wear clothes that suit you, I believe your shortcomings will eventually become advantages. At the same time, you should not always care about your physical deficiencies, because these things are actually not that important. As long as you have confidence in yourself, I believe everything will be fine in the end.