I have been learning piano for less than 2 years. I am currently learning sixteenth notes on PA 3B (although I have already learned sixteenth notes in my school band). My teacher has told me that her most advanced student, a freshman in high school, is at the same point as me in the book, introducing sixteenth notes. She has been learning for at least 7 or 8 years. My teacher even joked that I will probably be her most advanced soon. Is it normal to be learning at this fast rate??

P.S. I am 11 years old, I have once a week 45 minute lessons.

P.S.S. 2 of my friends, who have been learning longer than me, are also behind me. My friend who has learned for 3 years in on PA 2A. And another friend who has been learning for 6 years is also on PA 3B, but not as far.