Well, first of all, you're thirteen years old. It would be incredibly strange if you were not confused about everything right now. I know you think you "know it's different" but so does every teenager.

Secondly, just be who you are. Why do you need to label who you are? Why do you need to fit into a mold. Just be the person you are. Not all girls are girly.

In time, you will come to realize more fully who you are. The next 4 years of your life are the most crucial to developing your identity. It won't be easy, but just try to be yourself.