My papers always end up longer than I anticipated.
Overachiever. 
I've never understood why some professors give lengths for a paper, anyway. A paper should be as long as it needs to be, and no longer.
Now my experience is only high school, but I hated that even then.
I put it right up there with proofs for math. I mean if I can show you how to get the answer in 3 steps why do I have to try and figure out how to stretch it into 10?
(proofs were one of the things that almost made me fail math one year, my brain just doesn't work that way)