It looks fine.
The shoulders do look very heavily tailored- a look I personally love.
But check the insides and see if the lining is twisted at all, that could be causing some tightness. You ‘could’ see a tailor and have some of the lining let out and/or replace the foundations with softer shoulder pads and front facings but that really wouldn’t be worth the cost.

I think you’re right and you’re just not used to wearing such a tailored garment.
There is a huge amount of foundation or inner workings in a beautifully made jacket that the wearer can’t see and it can take some getting used to.