If I have buyers remorse, can I void the contract if I didn't have an attorney or didn't know the seller's profit? If not, why is a prenup different?

A Prenup is a Written Contract
A Prenup is a Written Contract

Is it the duty of courts to enforce written contracts? If I buy an expensive car and have buyer's remorse, can I void the contract if I was not represented by an attorney? Can I void the contract, if the dealer didn't volunteer the complete history of the car, even if didn't ask? Can I void the contract, if I was unaware how much profit the dealer made?

If not, and if it is the duty of courts to enforce written contracts, how can a court justify not enforcing prenuptial agreement that the parties voluntarily agreed to?

Updates
6 mo
The only way prenups will be treated like contracts is if a substantial number of high-value men, whom women want to marry, refuse to marry until they have equal protection in marriage under the law. That is because the government needs new tax slaves, and fewer tax slaves will not be enough to support the government and their programs.

Moreover, the government needs men to support children. When single women have children, the government must supplement the support the children receive.
If I have buyers remorse, can I void the contract if I didn't have an attorney or didn't know the seller's profit? If not, why is a prenup different?
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