If one has been coerced into marrying unwillingly, is the Nikah valid upon accepting verbally even though one does not agree or accept it from the heart?
Bismihi ta'ala
We have addressed this issue a few times, discussing coerced marriage being Islamically invalid and the worst kind of oppression.
The nikah would not be valid, because you are not willingly getting married.
Please see the other answers given on this topic of forced-marriage.
With prayers for your success.