Is my goal out of reach?

Ok. I'm 13. I'm a guy. I am very creative. I decided that I would write a book. I've been working on it and I have 40 pages on my Word Doent so far. I want to get it published when I finish it. I have the whole thing planned out in my head but getting it down is a little tricky. It's about teenagers but I don't want it to be another crappy teenager book where lame kids want to be popular, they get popular, and then realize being popular isn't for them. Those books are so generic and boring. I want it to be more than that. I want it to be like Narnia or Harry Potter where the actual story can pleaase children but there are adult sub-themes hidden between the lines. Is my goal too out-of-reach for someone of my age? I want to be able to break stereotypes and prove that not only can teens understand complex adult themes but produce them as well. Your thoughts?