I recently got a book from Barnes and Nobles called 'The Mysterious Benedict Society'. The book was from the 9-12yr olds section of the shop.

I'M FREAKEN 16!

I was kind of embarrassed to be in the same place where all the toddler were hanging out, I can hear them wining and crying in my head when I was there on black friday.

I really enjoyed that book when I started it but I losted it and never finished. I always thought it was a big and hard book to read even now after reading Fahrenheit 451 for class this year because of how big it is in comparison.

Does that make me a poor reader?

I mean, right now I'm also reading the fault in our stars too?

I only completed a few chapter books for my own leisure but that was when I was around 12, and that was only Caroline and the tale of Despereaux.

Not sure if serious, but if spelling and grammar are any indication, then your reading skills are probably atrocious.

Still, doesn't mean you can't get better. Just read whatever the fuck you like.

You can read whatever you like, I don't think it has much to with how well you can read.
But to answer your question (if you're a good reader or not)... Well, judging by your grammar skills here...