Before i had children i had soo much of my salary left now i have zero at the end of the month am i doing something wrong?

Sell your children. [Much shorter prison sentence than killing them.] Of course kids cost a lot !!  That is why most of us are not millionaires. P S - but here is hoping your kids make Christmas more joyful.

If you haven't figured it out by now what good is it for us to tell you the obvious?

Did you think that raising kids was cheap?  They cost a bundle.  Why isn't their father helping financially?  What to do - find a cheaper apartment/home.  Only use your car when you absolutely have to, or sell it and take the bus.

it now costs about $ 200,000 to raise a kid from 0 to 18 ( excluding college costs ) .