Yes, you are considered self-employed. You will probably qualify for QBI depending on your income.
The deduction amount depends on the taxpayer's total taxable income, which includes wages, interest, capital gains (etc.) in addition to income generated by the business. Once the taxable income reaches or exceeds $157,500 ($315,000 if filing jointly), the type of business also comes into play.
Here is a great read about QBI:
https://ttlc.intuit.com/replies/7019998
