A Sweat
A sweat is someone who thinks they're the best but they're actually just bad. They try so hard to be good that they end up looking like a sweaty, angry mess.
I tried to be the best at this game, but I still failed. Again.
I failed my math test, but I still tried to pass it by cheating.
I tried to make my character look cool, but I just ended up looking like a hot dog.