Losing muscle mass, maintaining Leanness

Im 5'9 about 140, and really thin. I have about a 32-34 inch chest and size 28 waist. However, last year i started doing calisthenics every day. Within months my shoulders got way broader and pectorils more pronounced. Now my problem is proportion, I want to get back to narrower shoulders to accompany my smaller frame and legs. How can I go about losing muscle and not gaining fat or loose skin from it. Also, even though I have a small waste, I have had, since I was young, naturally thick and stocky legs, upper thighs more. This causes problems when getting pants, sometimes wastes will be just right but the legs are too thin for me, so I need a bigger waste to make up for my thickers legs. Is it possible to lose mass in my thighs, which I have inherited from heredity, or are those just my genes and nothing I can do to change it. Thanks alot

By the way if diet is important, I will quickly describe my diet. Every morning I have a granola or fruit bar with some juice. Lunch a sandwich with salad and fruit. Dinner a sandwich or sometimes pasta with salad and fruit. I run maybe twice a week.
 
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