The flaw in Cantor's Diagonalization Argument

Diagonaliztion as a process involves constructing a number that cannot possibly exist in an infinite list of numbers of a set such as the reals, then because that list was assumed to have a bijection with the naturals it concludes that a bijection is impossible. This conclusion however is flawed in that it is never tests if diagonalization will also create a new natural number not in the list of natural numbers that we can then use to continue the bijection.

Say we have a list of all natural numbers:
3948593...
1085483...
7688312...
...
we can add one to the first digit of the first number, the second of the second number, and so on diagonally in order to construct a natural number not in the list: 4290337...
Because diagonalization can always create a new number in the naturals we can continue the bijection that Cantor abandoned and show that there is no contradiction.

 

Can someone please tell me I'm not crazy and this makes sense?

 

Rephrased for readability:

Cantor assumes a bijection between the reals and the naturals is possible.
Cantor shows a surjection from the reals to the naturals is impossible using diagonalization.
Cantor concludes his assumption leads to a contradiction and must be false.

I assume a bijection between the reals and the naturals is possible.
I show a surjection from the naturals to the reals is impossible using diagonalization.
I conclude Cantor's assumption of a contradiction leads to a contradiction itself because if two sets are not surjective into each other then both must be strictly larger than each other which is impossible.

I conclude there cannot be a contradiction in Cantor's argument and so there must be a bijection between the reals and the naturals.