It's hard to know on some days if you're supposed to be the storyteller, or the character. It's basically a question of scale, "what am I willing to be responsible for today?" The occasions I don't take on the whole world (whichever world it happens to be) I have the more daunting task of being responsible only for myself (whichever self I happen to be).
I love acting, I love immersing into a character and into a world and yes, influencing it from the inside out. Reacting to my co-stars, reliving past emotions in excitingly new scenarios, seeing how different a scene can be with this tweak or that, and laughing in the community of a film set call me to the world film. With any luck, I'll be lost on some CW set in a world of magic and madness sometime soon.