I am a US citizen, but legal resident of Honduras. Why do I owe any taxes at all if my income is below $60,000? (I have not seen the US for over 2 years.)

Obviously, I´m missing something. (I have very limited internet, so I can´t respond for probably a week.) Turbo program does not seem to understand by situation... or I do not understand my situation. 

I own nothing in the US. In Honduras, In Honduras, I have a car, 2 motorcycles, a house, etc. I´m not moving back to the US, likely, ever.

My income is well below the $60,000 figure.

A huge thanks for any help whatsoever.