[mawmow]

Welcome !
Your English is good to me even though it is not my mother tongue either. ;-)

My fretting hand fingernails are as short as they can,
some 3-4 mm behind the tip !

But first thing first : how is the action of your guitar at first fret ?
I want my folks at 1 mm, not more.

Second, you have to apply just the strenght needed to efficiently to avoid buzz.

Third, if it becomes painful under the end of the nail, acrylic glue would help.

Enjoy !