Nonstop 42 MH/s and balance still at 0

Hello everybody, I'm a new Ethereum enthusiast and this is my first post on the forum.

I'm mining alone (not in a pool) 42 MH/s nonstop since 24 days thanks to 2 GeForce GTX 1060 GPU.

I still have the weird:

> eth.getBalance(eth.coinbase)
0

This is my adress:
https://etherscan.io/address/0x459582fba9d13822e413151929fbf7c39a549210

Etherscan.io mining calculator says:

What is the standar deviation ? Is my situation still normal ? Am I doing something wrong ?