Sorry, but there was no excuse to not pay support for your child, even if your car broke down. Come on you didn't pay for THREE years. Your child still had needs, ligitimate needs, not made up needs out of spite.
You can try to get the amount lowered, or do what lots of us single parents have had to do when we didn't get child support, get a second job.
I know this sounds harsh, but there are some things in our lives that we THINK are requirements, but really aren't. Cut as many bills as you can (cable, going out to eat, etc), like I'm sure your child's mother had to do for the three years that your child recieved no support.
If you can't get the support lowered to a more reasonable amount, sit down make out a budget, figure out what you can do with out, and then get a second job to make up the rest.
Good luck.

