Well, he's the same age as you.
You have to be the same sex as the person who is the same age as you. Therefore, you cannot be Rock.
What about Ryoko or Ayeka from Tenchi Muyo? I'm not sure what age they are. But I'm the same age as Little Washu.
If you really want to be a guy, then you can be. I was just bugging you.
I know there is a no need for tenchi series, but I've only seen Tenchi Muyo and Tenchi Universe.
I'm almost 23... I'm gonna be an OBAASAN soon...