I was one of those girls what matured early. I had a full set of breasts at 9 yrs old. This made me naturally very curious about my body which was only supplemented by the fact that at one point in time my dad had a subscription to Playboy and my older brother and I stumbled upon them. I didn't necessary know what the forums were talking about, but I knew it made my pussy wet and all I wanted to do was stroke it and play with my clit (not that I even knew what it was at the time, but I knew that I liked rubbing between my legs).
When I first figured out what was going on down there, I immediately started experimenting - with some rather strange things.
I found a new use for My Little Pony Unicorn toy. I would lie down on my stomach and put the toy between me and the floor so that the horn would be directly against my clit. And then I would start humping it. It was sometimes a little bit painful, but I really enjoyed that because of pleasure/pain.
Another thing that I used to do was rub against book bindings. I am sure that my elementary school library has an enormous collection of pussy-soaked books.