Filling with sharp edge

[szbalogh]

I want to extract some figures from a photo and edit it. Want to fill the selection but it adds a thick border to it.
Soft edges are reduced to 0 pixels. If i add some 50 pixels it extends the border. 
How can i fill the selection only up to the selection line?
I am new to GIMP, please help, it is so annoying that i cant proceed.
   

[tmanni]

Use Select > Sharpen to remove soft edges from the selection.

[szbalogh]

(05-17-2020, 10:05 AM)tmanni Wrote: Use Select > Sharpen to remove soft edges from the selection.

Thank you very much. Figured out i need to sharpen before fill.