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So basically you do it, because it's what you're "supposed to do", like going to the prom and all that? >>
Umm, no. You do it because you want to. If you don't want to, then don't. I did it because I wanted to. But really I don't see why you are so concerned about not doing this because "everyone else does it." Signing a yearbook isn't taking drugs, its a simple thing high school kids do. I actually got out my yearbooks not too long ago to browse through them, and you know what? No one says anything meaningful, no one. But, reading the things people wrote brought back memories, and it was cool for me to think back to those days. I read the things some of my close friends wrote, however stupid, and it made me remember how fun it was just to hang with friends with not a damn thing to worry about.
I know it's cool to say you don't like to do what "everyone else does," but damn, lighten up a little. Your high school days are times you will never live again. You may think you have problems, but I'd be willing to bet that your life will never again be as simple as it is for you in high school. Enjoy it while you can.