I earned a demerit from a controller after entering Charlie airspace without permission. I'd been spending most of my flying in Class D airspace and have earned some CAT ratings.What is a demerit? Am I at risk of being kicked off PE if I earn another? Can''t say why, but I'm terrified of ATC but nevertheless been pressing through. My incursion demerit didn't help. 

 BTW: Although this is no excuse, I started making my calls 11 miles out, but didn't reach tower until I was where I thought was 8 miles out. Turns our I was actually closer. Saving grace is that this is a lesson I shall take to the real world. 
 
 
Frank
Aspiring Pilot