Did you have income other than the $20,000 you mentioned?
The tax rate you reported is for Federal Taxes.
Since you are self employed, you also need to pay FICA (self-employment) tax which is approximately 15%.
That is for your Federal Taxes.
State taxes:
If you are reporting that you earned all $20,000 in each state, then it is likely that you are overstating your earnings in each state. Usually a state only taxes what is earned in that state, and provides a deduction or exemption or credit for taxes paid to a different state.
I am not familiar with the states you mentioned so I can not address them specifically.
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