Is there a way that I can file my state taxes separately from my federal taxes? I already filed my federal taxes and I don't think I can unfile to add my state taxes.

Yes, as long as you have already efiled the federal return, you can efile the state return. The federal return must be efiled before you can file the state return. 

If you selected to mail the federal return, then you will need to also mail the state return.

Please see the instructions below for opening the tax return so you can file the state return.

• Sign in to your TurboTax Online account.
• From the "Welcome home" box on the left, Click on "Visit My Tax Timeline" below the "Download/print" return button.
• Under SOME THINGS YOU CAN DO click on Add a state. (You are not adding a state to your return.  By choosing this option it will allow us to open up your return.)
• On the Tax Timeline, click "State Taxes".
• Continue through the state return interview process.
• Click "Print & File" when you are ready to file the state return.
• Select "File a Return".
• Select "You’re Ready to E-file".

• Under Federal check Do Not E-file my Federal Return now, I’ll do it later. 

• Under State check E-file my State Return now.

I already filed my federal with free tax.com I was using turbo tax just for my state

@Browntyrone1981 No, sorry but that will not work.  When you use TurboTax the information flows from the federal return to the state return.   TT cannot be used to prepare a "stand alone" state return.   You could try getting the forms from your state and prepare them by hand, or your state might let you prepare them on the state site.   You will need a copy of your federal return to use some information from it in order to prepare a state return.

https://ttlc.intuit.com/community/state-taxes/help/how-do-i-contact-my-state-department-of-revenue/00/25573