Question

why shoulder is pronounced as sholder whereas should pronounced as shood afterall both have same spelling in beginning​?
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Answer 1

It depends on how the person pronounces it as it can be that there was pronounciation of L in ancient times in should

like that it can be people pronounced

U in the Shoulder

Answer 2

This is all for speaker's convenience which causes such change in pronunciation

Let me tell you an interesting fact:

Only languages having devanagari lipi have the property that despite what the word is, the pronunciation of each letter remains the same. For e.g.

HINDI (Devanagari lipi)

Chal Chalna. CHAL has the same pronunciation in both the cases

ENGLISH (Roman script)

Put But UT doesn't have the same pronunciation

Another example can be what you told: should and shoulder