I'm using Turbo Tax Self-Employment because we started a business in 2020. Shouldn't income go under Schedule C? It's entering it as 1099-NEC.

I thought 1099-NEC was reported to subcontractors or those who I paid.  

If it is the IRS that is supposed to provide me with a 1099-NEC, how would they know what my income has been for the tax year?  I paid estimated taxes.  But I don't report to them the income that's associated with those estimated taxes.  

Thank you!