Does this matter when it comes to reading?

I can read on a really high level. I am 16, but I read at a college level. So does it matter if I like to read books like Harry Potter or other kids books? Sometimes I read books intended for kids ages 10-13. But no kid 10-13 would read a 800 page Harry Potter book. None that I know of anyway. So does it matter if I enjoy books that are below my reading level. I just like fantasy, I Think that it is great to read about things that in real life, we would never get to experience. So is it bad if I read below my reading comprehension level?