Total US government receipts in 2013 are projected to be $5.56 trillion. US GDP for the same period is projected at $16.3 trillion.
State and local governments consume about 17% of GDP (averaging across all states). http://www.usgovernmentrevenue.com/state_tax_rank
Current US (federal) debt is $16.1 trillion, the burden of which is largely hidden by the fact that interest rates are currently extremely low.
Add to the above numbers an inflation tax of about 1.5 - 2.5%.
Your analysis starts by excluding any taxes you find inconvenient (such as, apparently, social security, inflation, tariffs, ad-valorem taxes, and especially state and local taxes -- which you somehow don't regard as governments) to get the numbers you want. If a business did accounting the way you just did, they'd rightfully land in jail.
But if you're just going to point to the national budget, echo popular political talk-show points about "$16 TRILLION IN DEBT OUR GRANDKIDS WILL HAVE TO PAY"...
You fail to mention who's going to pay it then? It must wonderful to be an Entitled One and write checks that someone else has to cash.
...and "WE'RE ON THE ROAD TO GREECE" then I'd argue you're completely missing the forest for the trees.
Unfortunately, you didn't argue it, you merely asserted it without any evidence and worse, started by providing "evidence" that was misleading at best.
As for Greece, I actually lived there 15 years ago. Even then the government was obviously bloated beyond all recognition, with government "jobs" that required little or no work being handed out as political favors. I left in part because I knew that the country would deteriorate eventually, with a rapidly aging population and three -- count 'em -- viable communist parties and one socialist party (PASOK) that was at that time the largest party in the country. Current newspaper reports and email accounts from a friend there sound pretty ominous.
Years ago a prominent foreign politician -- I'm sorry I can't remember who -- was asked how his country went bankrupt. He replied "Two ways. Slowly at first, then quickly."