It's odd that a guy of my age, wouldn't mastu much. Now I realized why. I have rough palm. Is it bad to a gf?

Some women like a soft gentle touch, other like rough manly hands... Either way the most important thing is to keep your nails trimmed and clean.

No woman likes a sharp nail down below...

Your age is unknown. A bit of a pointless first sentence.

Lots of girls like rough hands. That's why I use a cheese grater on mine every other night.

Mastu sounds Japanese.