Yes. You pay income tax on your total income plus self-employment tax on your self-employment income.
The self-employment tax is paying into the Social Security and Medicare system for your future benefit. If you had been paid wages on a W-2, Social Security and Medicare taxes would have been withheld from your wages and your employer would have also paid the same amount on your behalf for Social Security and Medicare tax. Since you do not have an employer when you are self-employed, you are responsible for paying the full amount through the Self-Employment tax collected through your tax return.
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