We do not consciously enter social contracts, we are born into them. As we grow, we must accept the terms we have been born into. If we don’t like them, tough.
We are taught the values and skills pertaining to one society. Alternatives are never given us.
Yes, we can choose to run off to some other country or go into the wilderness wearing nothing but a loin cloth, but this is a false choice if we have none of the survival skills to be able to successfully transition to another lifestyle.

People are social beings not well suited to living alone. Even when people did live in the wilderness, it was never alone. People are not very effective at surviving completely by themselves. In traditional societies, ostracism was nothing less than a death sentence.
The result is an unequal relationship.
We need society for survival. Society doesn’t particularly need any single one of us.
I suppose that in a small band everybody knows everybody else and a single individual’s effort makes a substantial difference. As such, they have some leverage in the affairs of their group.
As the group expands, the relationship between individual and society becomes increasingly lopsided.
In a nation state of millions or hundreds of millions, the individual is so small as to be beneath notice. Whatever society commands must be obeyed because one person holds no leverage.

Best wishes,

Nick