Comparing yourself with cis genetic women is a surefire way to depression, jealousy and other unhelpful emotions. It's only natural to compare and contrast I know, but it does tend to be a selective process which ignores the fact that there are plenty of burly genetic women too. If you pick and choose the most petite to compare yourself against then you're only doing yourself a massive disservice.
That said, yes, on average genetic women have smaller shoulders, rib cages, hands, feet, etc. There's not a lot we can do if testosterone has left us with the opposite but HRT and posture will help with shoulders. Ultimately, coming to terms with it and accepting it will help immensely. It doesn't change how you look but it does change how you feel about how you look.
At 6'3" I wish I was a good six inches shorter...ain't gonna happen so I just had to come to terms with it. I saw a trans woman at my endo's this week who was actually my ideal height but her shoulders must have been more than twice as wide as her hips. I know a trans woman almost as tall as me and her shoulders are remarkably square and broad and much wider than her hips. Maybe she wishes she was more petite, she never talks about it, but even so she has learned to accept and work with that. It's an unfortunate burden we have to bear sometimes.