The actual definition for a tool would have to be everyone if you follow the definitions of "poser." Don't kid yourself, you've tried to be someone you're not.
A tool is a gullible fool, which everyone was at one point.
So you wanna know who a tool is? Look in the mirror. Saying you're a tool because you listen to Good Charlotte? Please. You probably got made fun of for listening to them that's why you're saying it.