@riadassi
A lot of things affect the amount of tax that you owe. You can't rely on that to indicate whether you are getting the foreign earned income exclusion. You have to see if Form 2555 is included in your tax return, and whether the exclusion appears on Schedule 1 line 8d.
Note that the foreign earned income exclusion excludes the income only from income tax. Since you are self-employed, you still have to pay self-employment tax. Depending on other things in your tax return, it's possible that the amount you owe is just self-employment tax. That could be why the exclusion does not change the amount that you owe. Your income tax is on Form 1040 line 16. Self-employment tax is on Schedule 2 line 4, and is included in the amount on Form 1040 line 23.
