Looking at my old diary, do you think something was very wrong with me, if so what? I need answers?

So, I am 17 years old and I just recently found a "diary" (More like just a notebook I scribbled in and wrote my thoughts in) and I was very shocked at how underdeveloped I was.

I was 13 years old when I first started in it, and lets just say at first glance you'd think everything was written and drawn by a 7 year old. I wrote poems about my "blanky" which is a special blanket I've had since I was 10, I have pages and pages full of these little yellow imaginary friends, I used to pretend I was a princess of this big land full of little onion shaped creatures, most all of it is my adventures with this little creature I had.

I wrote about excited I was that we were going to grandma's house and how I was going to pack his things and we were going to have fun. I also have drawings of my favorite stuffed animals and these little rainbow colored bears.

Was something wrong with me? I know a few 13 year olds and they're all far more mentally developed then I was. I'm actually kind of worried, because that's pretty bad.

What are your thoughts on this?