I feel weird when i write with a leadless pencil?

The feeling you have is your body's natural response to internal pain. Nails on a chalkboard make people cringe because of a high pitch octave sound that we normally never hear, so the body goes into alert mode, heart rate increases with your blood pressure and you immediately stop doing what it is thats making that slight sound/feeling. Humans work in strange ways, and certain sound frequencies is one of them. People can actually go into deep meditation at certain sound frequencies, for me, I like 537hz, it's so soothing and I usually wind up falling asleep to this sound frequency.

Huhhh?

Lead-less pencil = pen?

Me too! I hate it

Honestly, pencils DO NOT have lead in them! Look it up!

I think you mean a lead less lead-pencil.
I myself know the sensation of scraping nails.
It's normal.

No pencil has lead in it, it's actually graphite.

That makes no sense

What's a leadless pencil?

A leadless pencil? This makes no sense what so ever.