Deductions & credits

Worksheet?  I'm not familiar with any worksheet that deals with that.  Do you know where that was?
Did you use the LOWEST cost for ONLY you (not dependents or family coverage)?
Did you use 9.56% (don't use 8.05%) of your total income (MAGI)?

Unless you have some losses (rental losses, loss in your business, etc.), it is extremely rare that you would qualify for the Premium Tax Credit.  That is because most employers are subject to very large fines if the cost is over 9.56% of your W-2.

In the event you actually do qualify for the Premium Tax Credit, you still don't qualify for the Self Employed Health Insurance deduction on Line 29.