OK, then, it's possible, but it's not carved in stone.
Excuse my bluntness, but you've been "misclassified" for 6 years and NOW you think you should be able to quit and receive UI benefits because you can't work the hours due to personal reasons that will get you your same compensation?
Self-employment tax is not an "ambiguous amount". It's 15.3% of earnings and that's what it IS, Social Security and Medicare tax.
Why didn't you just report this employer 6 years ago?

