why does she always reject divorce with me?

why does she always reject divorce with me?
I have no money,no property,no house
but a son.she works and make money for
herself and never support the family.
our son is 14 years old.whenever I
ask her agree with divorce with me,
she always rejects.Why?
I want to divorce with her because
she seldom support our family and
solve my finacial problems.as we
said,I have responsible to rear
the child and she make money outside,
but the thing doesn't go as we
expected.she is always bossy and
refuse to help me in term of
econmy.