Broad shoulders, muscle pain

Well Im 15 years old, im a boy

Ive started working out with weights after my mum told me I had broad shoulders which have naturally formed
I havent done a lot of excercise in over 3 years or more due to my kidney/liver transplants but Ive pushed myself to start this, Ive been doing weight for more than a week and muscle is starting to form already and I wonder is that due to broad shoulders.. and my shoulders and whole arm down to the wrist aches, obviously due to non exercise or forming of muscle?

so does anyone know what happening :confused:
 
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