This FAQ lists some possible reasons why TurboTax is telling you that you are self-employed: https://turbotax.community.intuit.ca/community/navigating-turbotax/help/why-is-turbotax-telling-me-i...

If you are still having issues, please contact our phone support for further assistance. You can get the correct number by using this form: https://support.turbotax.intuit.ca/contact/